301 ► Delaware, New Castle County, Wilmington — Iron Hill Iron Ore and Chert — sedimentary —

Near Kennett Pike (Delaware Route 52) north of Old Gatehouse Road, on the right when traveling south.

302 ► Delaware, New Castle County, Wilmington — Pegmatite — igneous —

Near Kennett Pike (Delaware Route 52) 0.3 miles north of Old Gatehouse Road, on the left when traveling north.

303 ► Delaware, New Castle County, Wilmington — Sillimanite — metamorphic mineral — Delaware's State Mineral —

On Kennett Pike (Route 52) north of Old Gatehouse Road, on the right when traveling south.

304 ► Delaware, New Castle County, Wilmington, Alapocas Run State Park — The blue rocks of Alapocas Run Park —

On Northern Delaware Greenway Trail, on the right when traveling north.

305 ► Delaware, New Castle County, Wilmington, Azimuth — NC-85 — Ebright Azimuth —

On Ebright Road at Ramblewood Drive, on the right when traveling north on Ebright Road.

306 ► Delaware, New Castle County, Wilmington, Hagley Museum — Rocks —

Near Hagley Creek Road north of Blacksmith Hill Road, on the right when traveling north.

307 ► Delaware, Sussex County, Bethany Beach — Indian River Inlet and Bridge — Nature vs. Technology —

On Turn Point Road (Local Road 50A) west of South Inlet Road, on the right when traveling west.

308 ► Delaware, Sussex County, Dewey Beach — Indian River Inlet and Bridge — Nature vs. Technology —

Near Inlet Road 0.6 miles south of Coastal Highway ( Route 1), on the left when traveling south.

309 ► District of Columbia, Washington, Northeast Washington, Kenilworth Park — Boardwalk to Tidal Marsh — Kenilworth Aquatic Gardens — National Park Service, U.S. Department of the Interior —

Near Anacostia Avenue Northeast south of Ponds Street Northeast, on the right when traveling south.

310 ► District of Columbia, Washington, Northeast Washington, Kenilworth Park — Under the Boardwalk — Kenilworth Aquatic Gardens — National Park Service, U.S. Department of the Interior —

Near Anacostia Avenue Northeast 0.2 miles west of Ponds Street Northeast, on the right when traveling west.

311 ► District of Columbia, Washington, Northwest Washington, Adams Morgan — The Colca Canyon w Peru - The deepest canyon in the world — 40th Anniversary of the First Descent of the Colca Canyon in Peru — Canoandes '79

On 16th Street Northwest just south of Fuller Street Northwest, on the right when traveling south. Reported permanently removed.

312 ► District of Columbia, Washington, Northwest Washington, Adams Morgan — Wanda Rutkiewicz — Outstanding Polish Women — #IamPolka

On 16th Street Northwest just south of Fuller Street Northwest, on the right when traveling south. Reported permanently removed.

313 ► District of Columbia, Washington, Northwest Washington, Former Walter Reed Army Medical Center — Site of a Tulip Tree —

On Butternut Street Northwest west of Georgia Avenue Northwest (Route 29), on the right when traveling west.

314 ► District of Columbia, Washington, Northwest Washington, Rock Creek Park — Piney Branch Wetland Restoration — Restauración del Pantano Piney Branch — A Rock Creek Songbirds Project / Un Projecto de Pájaros de Rock Creek —

On Piney Branch Parkway Northwest 0.2 miles west of Arkansas Avenue Northwest, on the right when traveling west.

315 ► District of Columbia, Washington, Northwest Washington, The National Mall — Welcome to Our Meadow! —

Near 12th Street Northwest at Constitution Avenue Northwest (U.S. 1/50), on the right when traveling south.

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316 ► District of Columbia, Washington, Southeast Washington, Anacostia Park — The Anacostia River Floodplain — Anacostia Park — National Park Service, U.S. Department of the Interior —

Near Anacostia Drive Southeast 0.5 miles north of Nicholson Street Southeast, on the right when traveling north.

317 ► District of Columbia, Washington, Southeast Washington, Anacostia Park — The Life of a River —

Near Anacostia Drive Southeast 0.4 miles north of Nicholson Street Southeast, on the right when traveling north.

318 ► District of Columbia, Washington, Southwest Washington, The National Mall — Cardinal Direction Marker: North —

On Jefferson Drive Southwest just east of 4th Street Southwest, on the right when traveling east.

319 ► District of Columbia, Washington, Southwest Washington, The National Mall — Cardinal Direction Marker: South —

On Maryland Avenue Southwest just east of Independence Avenue Southwest, on the left when traveling east.

320 ► District of Columbia, Washington, Southwest Washington, The National Mall — Cardinal Direction Marker: West —

On 4th Street Southwest just north of Independence Avenue Southwest, on the right when traveling north.

321 ► District of Columbia, Washington, Southwest Washington, The National Mall — Wingapo — Restoration of the Land

On Jefferson Drive Southwest at 4th Street Southwest, on the right when traveling east on Jefferson Drive Southwest. Reported permanently removed.

322 ► Florida, Alachua County, Gainesville — Alachua Sink —

Near Southeast 15th Street (Camp Ranch Road) 0.4 miles south of Southeast 41st Avenue when traveling south.

323 ► Florida, Alachua County, Gainesville — Devil's Millhopper — Registered Natural Landmark —

Near Millhopper Road (NW 53rd Avenue) 0.2 miles east of NW 52nd Terrace, on the left when traveling east.

324 ► Florida, Broward County, Weston — FDOT Mitigation Mission —

Near U.S. I-75 at milepost 35, at U.S. 27, on the right when traveling west.

325 ► Florida, Collier County, Naples, Corkscrew — 12 — Landmark Cypress № 12 - “Hemenway” — Landmark Cypress — Corkscrew Swamp Sanctuary —

Near Sanctuary Road West at Rookery Lane.

326 ► Florida, Columbia County, Fort White — Ichetucknee Springs —

Near SW Elim Church Road (County Road 238) 0.2 miles east of SW Ichetucknee Avenue, on the right when traveling east.

327 ► Florida, Duval County, Jacksonville, Fort Caroline Shores — Spanish Pond — Fort Caroline National Monument — Timucuan Ecological and Historic Preserve —

On Ft. Caroline Road, on the right when traveling east.

328 ► Florida, Duval County, Jacksonville, St. Johns Bluff — Timucuan Preserve — Fort Caroline National Monument — Timucuan Ecological and Historic Preserve —

Near Ft. Caroline Road, on the left when traveling east.

329 ► Florida, Escambia County, Pensacola — E — Defending a Coastal Colony — Pensacola Maritime Heritage Trail —

Near East Main Street east of South Barracks Street, on the right when traveling east.

330 ► Florida, Leon County, Tallahassee — Nature's Bridge —

Near Natural Bridge Road 6 miles east of Woodville Highway (State Highway 363), on the left when traveling east.

331 ► Florida, Marion County, Dunellon — Rainbow Springs —

Near State Road 41.

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332 ► Florida, Martin County, Jupiter Island — Hobe Mountain Tower —

Near Southeast Federal Highway.

333 ► Florida, Miami-Dade County, Homestead, Biscaine National Park — Dante B. Fascell — ...for the enjoyment of people now and forever. — Biscayne National Park, Dante Fascell Visitor Center —

Near Southwest 328th Street 2.9 miles east of SW 117th Avenue, on the right when traveling east.

334 ► Florida, Miami-Dade County, Miami — Crossing the Everglades —

On Shark Valley Loop Road south of Tamiami Trail (Southwest 8th Street) (U.S. 41), on the left when traveling south.

335 ► Florida, Miami-Dade County, Miami, Brickell — The Miami Circle

Near Brickell Avenue (U.S. 1/41) north of Southeast 5th Street, on the right when traveling north. Reported unreadable.

336 ► Florida, Monroe County, Islamorada — Geological History of the Florida Keys — Heritage Monument Trail, Matacumbe Historical Trust —

Near Overseas Highway (U.S. 1) near North Ocean Lane, on the left when traveling north.

337 ► Florida, Okaloosa County, Eglin Air Force Base — B-57 Canberra —

Near Pinchot Road (State Road 189) at Museum Drive, on the right when traveling south.

338 ► Florida, Orange County, Apopka — Dr. Howard A. Kelly Park —

Near East Kelly Park Road.

339 ► Florida, Orange County, Apopka — F-868 — Dr. Howard A. Kelly Park —

On Baptist Camp Road north of East Kelly Park Road, on the right when traveling north.

340 ► Florida, Osceola County, Kissimmee — Petrified Wood —

Near Florida Plaza Blvd 0.3 miles south of West Irlo Bronson Highway (U.S. 192), on the right when traveling east.

341 ► Florida, Osceola County, Kissimmee — The Yates Fords — Pioneer Village at Shingle Creek —

Near Babb Road 0.2 miles north of Princess Lane, on the right when traveling north.

342 ► Florida, Polk County, Homeland — F-719 — Historic Kissengen Spring —

Near Homeland-Garfield Road (County Road 640) 1 mile east of U.S. 17/98, on the left when traveling east.

343 ► Florida, Santa Rosa County, Bagdad — A New Century —

Near Main Street 0.1 miles east of Forsyth Street.

344 ► Florida, Santa Rosa County, Bagdad — Submerged Aquatic Vegetation —

Near Main Street 0.1 miles east of Forsyth Street.

345 ► Florida, Sarasota County, Sarasota — F-103 — Yellow Bluffs —

On North Tamiami Trail (U.S. 41) near 11th Street, on the right when traveling south.

346 ► Florida, St. Johns County, St. Augustine, Anastasia — F-229 — Old Spanish Quarries — (Anastasia Island) —

Near Park Road 0.1 miles east of Anastasia Boulevard (Road A1A).

347 ► Florida, Washington County, Chipley — F-174 — Falling Waters State Park —

On State Park Road 0.6 miles south of Jouner Road, on the left when traveling west.

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348 ► Georgia, Athens-Clarke County, Athens — River Overview — Taking Care of the River —

Near East Broad Street east of Wilkerson Street, on the right when traveling east.

349 ► Georgia, Brantley County, Hoboken — 84 B-7 — Trail Ridge —

On U.S. 82 0.4 miles west of Petty Crossing Road, on the right when traveling east.

350 ► Georgia, Butts County, Jackson — Indian Spring —

Near Spring Road west of Highway 42, on the right when traveling south.

351 ► Georgia, Catoosa County, Ringgold — 023-2 — Nickajack Gap —

On Alabama Highway (Georgia Route 151) at East Nickajack Road, on the left when traveling south on Alabama Highway.

352 ► Georgia, Chatham County, Savannah, North Historic District — Gray's Reef National Marine Sanctuary — National Oceanic and Atmospheric Administration —

Near East River Street east of East Upper Factors Walk, on the left when traveling south.

353 ► Georgia, Cook County, Adel — 037-2 — Adel Lime Sink —

On East Fourth Street (Georgia Route 37) at South Gordon Street, on the right when traveling east on East Fourth Street.

354 ► Georgia, Dade County, Rising Fawn — Stories in Stone — Cloudland Canyon Rugged Landscape —

Near Cloudland Canyon Park Road 1.5 miles north of Route 136, on the left when traveling north.

355 ► Georgia, Greene County, Union Point — Great Buffalo Lick —

On Union Point Highway (U.S. 278) at Buffalo Lick Road, on the right when traveling east on Union Point Highway.

356 ► Georgia, Habersham County, Cornelia — 068-2 — Indian War Trail —

On South Main Street (U.S. 129/441) at Dolston Street, on the left when traveling north on South Main Street.

357 ► Georgia, Harris County, Pine Mountain — 072-7 — “This Was His Georgia”

On Dowdell Knob Road 1.4 miles south of Route 190. Reported permanently removed.

358 ► Georgia, Meriwether County, Woodbury — 18 F-2 — The Cove Gorges of the Flint —

On Cove Road at Upper Cove Church Road, on the right when traveling north on Cove Road.

359 ► Georgia, Stewart County, Lumpkin — 128-1 — Providence Canyons — >>> -- 8 mi. --> —

On Broad Street (Georgia Route 39 Connector Road) at Chestnut Street (Old U.S. 27), on the right when traveling east on Broad Street.

360 ► Georgia, Taylor County, Butler — 133-1 — Tuscaloosa Formation —

On U.S. 19 0.1 miles south of Jack Peed Road, on the right when traveling south.

361 ► Georgia, Towns County, Blairsville — 139-5 — Brasstown Bald — The Highest Point in Georgia ~ 4,784 ft. —

Near Georgia Route 180 Spur 0.5 miles north of Brasstown Bald Vistor's Center Parking Log.

362 ► Georgia, Towns County, Hiawassee — 139-4 — Brasstown Bald — >>>-- 6 Mi. --> —

On Unicoi Turnpike (Georgia Route 75) at Route 180, on the left when traveling south on Unicoi Turnpike.

363 ► Georgia, Twiggs County, Jeffersonville — 143-11 — Geographic Center of Georgia —

On Jeffersonville-Bullard Road at Marion Road, on the right when traveling east on Jeffersonville-Bullard Road.

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364 ► Georgia, Union County, Blairsville — 144-3 — Blood Mountain —

On U.S. 19, on the right when traveling north.

365 ► Georgia, Union County, Young Harris — US 76 C-2 — Brasstown Bald

On Young Harris Highway (U.S. 76) at Trackrock Gap Road, on the right when traveling east on Young Harris Highway. Reported missing.

366 ► Georgia, Walker County, Chickamauga — Cooper's Gap — Chickamauga Campaign Heritage Trail —

On Hidden Hollow Lane 0.5 miles east of Lookout Mountain Scenic Highway ( Route 136), on the left when traveling east.

367 ► Georgia, Walker County, Chickamauga — Stephens Gap — Chickamauga Campaign Heritage Trail —

On Fricks Gap Road at Harold Stevens Road, on the right when traveling east on Fricks Gap Road.

368 ► Georgia, Ware County, Waycross — 148-3 — Okefenokee Swamp — >>>-- 13 mi. -- > —

On Memorial Drive (U.S. 1) at Corridon Z (U.S. 82), in the median on Memorial Drive.

369 ► Georgia, Warren County, Jewells Mill — 149-4 — Shoals on the Ogeechee —

On State Highway 123 at Shoals Road, on the left when traveling south on State Highway 123.

370 ► Georgia, White County, Helen — 154-10 — Nacoochee Valley — Valley of the Evening Star —

On Unicot Turnpike (Georgia Route 17) 0.6 miles east of Route 75, on the left.

371 ► Georgia, Whitfield County, Rocky Face — 155-13 — Mill Creek Gap —

On Old US 41 0.1 miles east of Rocky Face Railroad Street, on the left when traveling east.

372 ► Georgia, Whitfield County, Rocky Face — 155-13 — Mill Creek Gap —

On Chattanooga Road (U.S. 41), on the left when traveling south.

373 ► Hawaii, Hawaii County, Naalehu — South Point Complex —

On South Point Road 11 miles south of Mamalahoa Highway (Hawaii Route 11), on the left when traveling south.

374 ► Hawaii, Hawaii County, Pāhoa — Mauna Ulu —

On Chain of Craters Road (at milepost 6.4) near Hilina Pali Road, on the right when traveling south.

375 ► Hawaii, Hawaii County, Pāhoa — Mokumanamana is a place of spiritual and geologic transition —

Near Chain of Craters Road near Hilina Pali Road.

376 ► Hawaii, Hawaii County, Pāhoa — Nature's Untamed Forces Unite to Sculpt Sea Arches —

On Chain of Craters Road near Hilina Pali Road.

377 ► Hawaii, Hawaii County, Pāhoa — The islands of Hawai'i begin here —

Near Chain of Craters Road near Hilina Pali Road.

378 ► Hawaii, Hawaii County, Pāhoa — Vast coral reefs create a world of abundance —

Near Chain of Craters Road near Hilina Pali Road.

379 ► Hawaii, Hawaii County, Volcano — Explosive eruptions rock Kīlauea volcano —

Near Crater Rim Drive near Mauna Loa Road, on the left when traveling west.

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380 ► Hawaii, Hawaii County, Volcano — Kilauea — Rising Smoke Cloud — Hawaii Volcanoes National Park —

On Crater Rim Drive.

381 ► Hawaii, Hawaii County, Volcano — Mauna Loa —

Near Crater Rim Drive near Mauna Loa Road, on the left when traveling west.

382 ► Hawaii, Hawaii County, Volcano — The "Firepit" of Halema'uma'u —

Near Crater Rim Road.

383 ► Hawaii, Hawaii County, Waimea — Pu'uhuluhulu — Daniel K. Inouye Highway —

On Daniel K. Inouye Highway (Saddle Road) (Route 200 at milepost 28) at Mauna Kea Access Road, on the right when traveling east on Daniel K. Inouye Highway (Saddle Road).

384 ► Hawaii, Kauai County, Poipu — 1 — Spouting Horn Park — Kōloa Heritage Trail — Ka Ala Hele Waiwai Ho‘olina o Kōloa — Preserving the Heritage of Po‘ipū & Kōloa —

On Lawai Road south of the traffic circle on Poipu Road (Hawaii Route 520), on the left when traveling west.

385 ► Hawaii, Kauai County, Poipu — 8 — Makawehi & Pā‘ā Dunes — Kōloa Heritage Trail — Ka Ala Hele Waiwai Ho‘olina o Kōloa — Preserving the Heritage of Po‘ipū & Kōloa —

Near Ainako Street south of Poipu Road, on the right when traveling south.

386 ► Hawaii, Kauai County, Poipu — 9 — Pu‘uwanawana Volcanic Cone — Kōloa Heritage Trail — Ka Ala Hele Waiwai Ho‘olina o Kōloa — Preserving the Heritage of Po‘ipū & Kōloa —

On Ala Kinolike Highway north of Poipu Road, on the right when traveling north.

387 ► Hawaii, Maui County, Hana — Haleakala National Park — Kipahulu: Costal District —

On Hana Highway.

388 ► Hawaii, Maui County, Hana, Kipahulu — Ma Ka Hana Ka 'Ike / Insight Through Experience —

Near Kuloa Point Loop Trail.

389 ► Hawaii, Maui County, Hana, Kipahulu — 'Ike Aku, 'Ike Mai, Kokua Aku, Kokua Mai, Pela Ka Nohona 'Ohana — Haleakāla National Park — National Park Service, U.S. Department of the Interior —

Near Kuloa Point Loop Trail.

390 ► Hawaii, Maui County, Kaanapali — The Stones of Moemoe and Wahine O Manua — Ka'anapali Historical Trail —

On Kekaa Drive north of Kualapa Loop, on the left when traveling north.

391 ► Hawaii, Maui County, Kula — Haleakalā National Park — Summit District —

On Crater Road.

392 ► Hawaii, Maui County, Wailuku — Kūka‘emoku — [ʻĪao Valley] —

Near Iao Valley Road (Hawaii Route 32) when traveling west.

393 ► Hawaii, Maui County, Wailuku — Kūka'emoku - 'Īao Needle —

Near 'Iao Needle Lookout Trail and Ethnobotanical Loop west of Iao Valley Road.

394 ► Hawaii, Maui County, Wailuku — Ka Wai Ola O Kāne (The Living Waters of Kāne) —

Near Iao Needle Lookout Trail and Ethnobotanical Loop at Iao Valley Road, on the right when traveling west.

395 ► Hawaii, Maui County, Wailuku — Ko Lalo Kuilani Aloha —

On Honoapiilani Highway (Hawaii Route 30) east of Maaleaea Road, on the right when traveling east.

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396 ► Idaho, Ada County, Meridian — 193 — Initial Point —

On Main Street at Franklin Road, on the right when traveling north on Main Street.

397 ► Idaho, Bannock County, Downey — 171 — Red Rock Pass —

On U.S. 91 at milepost 30.2 near South Old Oxford Highway, on the right when traveling north.

398 ► Idaho, Bannock County, Lava Hot Springs — 13 — Lava Hot Springs —

Near Main Street near U.S. 30, on the right when traveling west.

399 ► Idaho, Bannock County, Lava Hot Springs — Lava Hot Springs' healing waters —

On Main Street near U.S. 30, on the right when traveling west.

400 ► Idaho, Bannock County, Pocatello — Pocatello — Area Geology —

Near South Arthur Avenue at Center Street, on the right when traveling south.

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