1 ► Alabama, Jackson County, Woodville — Cathedral Caverns —

Near Cave Road 0.7 miles east of Cathederal Caverns Road, on the left when traveling east.

2 ► American Samoa, Vaifanua County, Vatia — Vai'ava Strait —

Near American Samoa Route 006.

3 ► Arizona, Coconino County, Jacob Lake — Kaibab Squirrel Area —

On Arizona Route 67 at U.S. 89A, on the right when traveling south on Arizona Route 67.

4 ► Arkansas, Fulton County, Mammoth Spring — Mammoth Spring — National Natural Landmark —

Near U.S. 63 at Main Street (State Route 9), on the right when traveling north.

5 ► California, Los Angeles County, Los Angeles, Miracle Mile — Rancho La Brea — National Natural Landmark —

Near Wilshire Boulevard, on the left when traveling east.

6 ► California, San Bernardino County, Amboy — 92 — Amboy Crater — National Natural Landmark —

On Crater Road 0.5 miles west of National Trails Highway, on the right when traveling west.

7 ► California, San Bernardino County, Trona — Welcome to the Trona Pinnacles — ... a National Natural Landmark —

Near California Route 178.

8 ► California, San Diego County, Borrego Springs — Anza-Borrego Desert State Park — Visitor Center —

On Palm Canyon Drive 1.8 miles west of Borrego Springs Road, on the right when traveling west.

9 ► California, Shasta County, Burney — Burney Falls —

Near Highway 89, on the left when traveling north.

10 ► California, Siskiyou County, Mt. Shasta — Mount Shasta —

Near West Alma Street near Maple Street when traveling south.

11 ► Colorado, Douglas County, Littleton, Roxborough State Park — Roxborough State Park —

On Roxborough Drive 4.5 miles south of Watertown Road, in the median.

12 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — A Priceless Gift — Garden of the Gods Park —

Near Garden Drive.

13 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — Garden of the Gods Park —

On Gateway Road, on the right when traveling east.

14 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — Time Frozen In Stone — Garden of the Gods Park —

Near Garden Drive.

15 ► Colorado, Jefferson County, Morrison — Morrison Fossil Area — National Natural Landmark —

On West Alameda Parkway 0.1 miles south of Hog Back Road (County Road 93), on the left when traveling south.

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16 ► 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.

17 ► Florida, Alachua County, Gainesville — Living Links to Florida's Past —

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

18 ► Florida, Collier County, Naples — What Makes Corkscrew Swamp Special? — National Natural Landmark —

Near Rookery Lane north of Sanctuary Road West, on the left when traveling north.

19 ► Florida, Marion County, Ocala — Home of Silver Springs — Greetings from Marion County — America250FL Road Trip —

Near Interstate 75 at milepost 346, 3.7 miles south of Southwest College Road (Florida Route 200), on the right when traveling south.

20 ► Florida, Wakulla County, Wakulla Springs — F-394 — Wakulla Springs Archaeological & Historic District —

Near Wakulla Park Drive 0.5 miles north of Wakulla Springs Road (State Road 61).

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

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

22 ► 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.

23 ► Idaho, Cassia County, Oakley — 344 — City of Rocks —

On State Highway 27 at milepost 1, 0.2 miles north of 1800 South Road, on the right when traveling south.

24 ► Illinois, Cook County, Markham — Markham Prairie —

On Whipple Street 0.3 miles north of 159th Street (U.S. 6).

25 ► Illinois, McLean County, McLean, Funks Grove Township — Funks Grove Church —

Near East 535 North Road 0.2 miles west of North 725 East Road, on the right when traveling west.

26 ► Illinois, Monroe County, Fults — Fults Hill Prairie —

On Bluff Road (County Road 3) 0.2 miles south of Kidd Lake Road, on the right when traveling west.

27 ► Indiana, Clark County, Clarksville — Falls of the Ohio Fossil Beds —

Near West Riverside Drive north of West Winbourne Avenue, on the left when traveling north.

28 ► Indiana, Crawford County, Marengo — Marengo Cave National Landmark —

Near State Road 64 0.2 miles east of Main Street (State Road 66).

29 ► Indiana, Fountain County, Covington — Portland Arch Natural Preserve —

Near West Scout Camp Road (County Road 600 N) 0.4 miles south of North Walnut.

30 ► Indiana, Porter County, Chesterton — Cowles Bog —

Near West Dunes Highway (U.S. 12) at North Mineral Springs Road, on the right when traveling west.

31 ► Indiana, Porter County, Chesterton — Dunes Nature Preserve —

On Trail 8, on the right when traveling north.

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32 ► Indiana, Porter County, Dune Acres — Dune Creek Watershed: What Makes It Special? —

Near County Road 25E 0.1 miles north of Indiana Dunes State Park Drive, on the right when traveling north.

33 ► Indiana, Porter County, Porter — History of the Dunes —

Near Calumet Trail east of Indiana Route 49, on the left when traveling east.

34 ► Indiana, Wabash County, Lagro — Hanging Rock — National Natural Landmark —

Near E. Hanging Rock Road 0.8 miles east of State Road 524, on the left when traveling east.

35 ► Kansas, Gove County, Oakley — Monument Rocks Chalk Pyramids —

On Gove County Road 16.

36 ► Kansas, Ottawa County, Minneapolis — Welcome to Rock City —

Near Ivy Road.

37 ► Michigan, Berrien County, Three Oaks, Chikaming Township — Warren Woods State Park —

Near Warren Woods Road.

38 ► Missouri, Oregon County, Koshkonong — Grand Gulf —

Near County Highway 378 at State Highway W.

39 ► Missouri, Stone County, Branson — Marvel Cave —

On Foods Warehouse Lane 0.2 miles west of Silver Dollar City Parkway, on the right when traveling east.

40 ► Nebraska, Grant County, Hyannis — Nebraska Sand Hills — National Natural Landmark —

On Harrison Street just west of Grant Avenue, on the right when traveling west.

41 ► Nevada, Clark County, Overton — Valley of Fire —

Near Visitor Center Road.

42 ► New Jersey, Somerset County, Franklin Twp — William L. Hutcheson Memorial Forest — National Natural Landmark —

Near Amwell Rd (County Route 514).

43 ► New York, Albany County, Albany — National Natural Landmark —

Near New Karner Road (New York State Route 155) at Old State Road.

44 ► New York, Monroe County, Fairport — Hart's Woods —

Near Clarkes Crossing.

45 ► Ohio, Ashland County, Loudonville — 6-3 — Clear Fork Gorge — A Feature of Ohio's Forests —

Near Gorge Overlook, on the right when traveling east.

46 ► Ohio, Ashland County, Perrysville, Green Township — Discover — Mohican State Park —

On Park Road at Lyons Falls Trail, on the left when traveling north on Park Road.

47 ► Ohio, Champaign County, Urbana — Cedar Bog —

On Woodburn Road (County Road 91) 0.9 miles west of U.S. 68, on the right when traveling west.

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48 ► Ohio, Champaign County, Urbana — 6-11 — Cedar Bog Nature Preserve —

On Woodburn Road (County Route 91), on the right when traveling west.

49 ► Ohio, Cuyahoga County, Walton Hills, Sagamore Hills Township — Tinker's Creek is Gorgeous — Cleveland Metroparks —

On Gorge Parkway 1 mile west of Egbert Road, on the right when traveling west.

50 ► Ohio, Erie County, Kelleys Island — Welcome to Glacial Grooves Geological Preserve — a National Natural Landmark —

On Division Street at Titus Road, on the right when traveling south on Division Street.

51 ► Ohio, Fulton County, Archbold — Goll Woods — 100 Acres of Virginia Timber —

On County Road 26 0.3 miles south of County Road F, on the right when traveling north.

52 ► Ohio, Greene County, Clifton — Clifton Gorge Marker — The Old Trail Head — The Obscure Marker —

On Jackson Street 0.1 miles south of St Rt 343 (Ohio Route 343), on the right when traveling south.

53 ► Ohio, Lake County, Mentor — Mentor Lagoons Nature Preserve —

On Harbor Drive at Mentor Marina, on the right when traveling north on Harbor Drive.

54 ► Ohio, Lake County, Mentor — Mentor Lagoons Nature Preserve — Parking Lots & Trailheads —

On Harbor Drive at Mentor Marina, on the right when traveling north on Harbor Drive.

55 ► Oregon, Lake County, Fort Rock — Fort Rock State Park —

Near County Road 5-11A west of Cabin Lake Road.

56 ► Pennsylvania, Berks County, Kempton, Albany Township — Hawk Mountain Sanctuary —

On Hawk Mountain Road just north of Pennsylvania Route 895, on the left when traveling north.

57 ► Pennsylvania, Carbon County, Weissport — Exploring the Corridor — 1828 - 1932 — Delaware & Lehigh National Heritage Corridor —

On Main Road.

58 ► Pennsylvania, Carbon County, White Haven, Kidder Township — Hickory Run Boulder Field — Hickory Run State Park —

Near Pennsylvania Route 534.

59 ► Pennsylvania, Erie County, Erie, Millcreek Township — Presque Isle —

On Peninsula Drive, on the right when traveling north.

60 ► Pennsylvania, Fayette County, Connellsville — Connellsville — Trail Map and Points of Interest —

Near Great Allegheny Passage (North).

61 ► Pennsylvania, Lycoming County, Jersey Shore, Watson Township — Glacier to Gorge — An Incredible Diversion — Pine Creek Rail Trail —

Near Pennsylvania Route 44 0.1 miles north of Furnace Run Road, on the left when traveling north.

62 ► Pennsylvania, Perry County, Blain, Toboyne Township — Big Spring State Park — A Travelers Rest And Trailhead For The Hemlocks — Perry County Bicentennial 1820-2020 —

Near Big Spring Road (Pennsylvania Route 274) east of Hemlock Road, on the right when traveling east.

63 ► Pennsylvania, Philadelphia County, Philadelphia, Logan Square — Wissahickon Valley — 1868 — Parkway Museums District —

On North 18th Street just south of Vine Street, on the left when traveling north.

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64 ► Pennsylvania, Philadelphia County, Philadelphia, Roxborough — Park Directory — Wissahickon Valley Park —

On Wissahickon Bike Trail at Ridge Avenue (County Road 3009), on the left when traveling north on Wissahickon Bike Trail.

65 ► Pennsylvania, Philadelphia County, Philadelphia, Wissahickon Valley Park — Forbidden Drive — 1869 —

On Forbidden Drive at Lincoln Drive, on the right when traveling west on Forbidden Drive.

66 ► Pennsylvania, Philadelphia County, Philadelphia, Wissahickon Valley Park — Park Directory — Wissahickon Valley Park —

On Forbidden Drive just south of Valley Green Road, on the left when traveling north.

67 ► Pennsylvania, Philadelphia County, Philadelphia, Wissahickon Valley Park — Wissahickon Valley Park — Park Directory —

On Forbidden Drive north of Lincoln Drive, on the right when traveling north.

68 ► Pennsylvania, Tioga County, Shippen Township — Pine Creek — Grand Canyon of Pennsylvania —

Near Pennsylvania 660.

69 ► Pennsylvania, Wayne County, Lake Ariel — Lake Lacawac —

Near Sanctuary Road.

70 ► South Dakota, Charles Mix County, Pickstown, White Swan Township — Fort Randall Eagle Roost —

On Power House Drive.

71 ► South Dakota, Fall River County, Hot Springs — 680 — Mammoth Site of Hot Springs, SD —

On Bypass U.S. 18 near South 19th Street, on the right when traveling west.

72 ► South Dakota, Harding County, Reva — The Castles —

Near Forest Road 31261 0.2 miles south of Forest Road 3126.

73 ► South Dakota, Roberts County, Browns Valley — 547 — Ancient River Warren Channel —

On an unnamed road 0.2 miles east of State Highway 10, on the left when traveling east.

74 ► South Dakota, Roberts County, Sisseton — Sieche Hollow —

Near 113th Street.

75 ► Vermont, Lamoille County, Underhill — Mount Mansfield Natural Area — National Natural Landmark —

Near Mount Mansfield Auto Toll Road 4.5 miles Mountain Road (State Route 108).

76 ► Virginia, Augusta County, Grottoes — Civil War Tourism Attraction — Soldiers Visit Weyers Cave —

On Grand Cavern Road 0.2 miles west of South River Road, on the right when traveling west.

77 ► Virginia, Page County, Luray — Luray Caverns

Near Cave Hill Road 0.2 miles west of Lee Highway (U.S. 340), on the left when traveling west. Reported permanently removed.

78 ► Virginia, Page County, Luray — The Beautiful Caverns of Luray — Welcome to Luray Caverns —

Near Cave Hill Road 0.2 miles west of Lee Highway (U.S. 211/340), on the left when traveling west.

79 ► Virginia, Rockingham County, Grottoes — Civil War Tourism Attraction — Soldiers Visit Weyers Cave

On Grand Caverns Drive, on the right when traveling west. Reported permanently removed.

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80 ► Washington, Whitman County, Steptoe — 31 — Steptoe Butte — The Evergreen State —

On U.S. 195 0.4 miles south of Kerns Avenue (State Highway 23), on the right when traveling north.

81 ► West Virginia, Greenbrier County, Caldwell — Confederate Saltpeter Works — Civil War Industrial Center —

On West Virginia Route 63.

82 ► West Virginia, Pocahontas County, Bartow — Greenbrier Ranger District Centennial 1922-2022 — Monongahela National Forest — Caring for the land and serving people —

On Staunton Parkersburg Turnpike (U.S. 250) 0.3 miles west of Old Pike Road (County Road 3), on the right when traveling west.

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