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 State 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, 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.

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

Near California Route 178.

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

Near Highway 89, on the left when traveling north.

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

Near West Alma Street near Maple Street when traveling south.

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

Near Garden Drive.

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

On Gateway Road, on the right when traveling east.

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

Near Garden Drive.

12 ► 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.

13 ► 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.

14 ► 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.

15 ► 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).

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16 ► 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.

17 ► 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.

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

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

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

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

20 ► 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.

21 ► 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.

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

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

Near County Highway 378 at State Highway W.

24 ► 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.

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

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

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

Near Visitor Center Road.

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

Near Amwell Rd (County Route 514).

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

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

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

Near Clarkes Crossing.

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

Near Gorge Overlook.

31 ► 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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32 ► Ohio, Champaign County, Urbana — 6-11 — Cedar Bog Nature Preserve —

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

33 ► 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.

34 ► 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.

35 ► 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.

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

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

37 ► 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.

38 ► Pennsylvania, Carbon County, White Haven — Hickory Run Boulder Field — Hickory Run State Park —

Near Pennsylvania Route 534.

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

On Peninsula Drive, on the right when traveling north.

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

Near Great Allegheny Passage (North).

41 ► 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.

42 ► 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.

43 ► 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.

44 ► 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.

45 ► 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.

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

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

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

49 ► 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.

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

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

51 ► 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.

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

53 ► Vermont, Lamoille County, Stowe — Mount Mansfield Natural Area — National Natural Landmark —

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

54 ► 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.

55 ► 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.

56 ► 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.

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

On West Virginia Route 63.