57 entries match your criteria.
National Natural Landmarks Historical Markers
Department of the Interior markers at sites possessing exceptional value illustrating the nation’s natural heritage and contributing to a better understanding of man’s environment.
By Sandra Hughes, August 13, 2014
Cathedral Caverns Marker
1 ► Alabama, Jackson County, Woodville — Cathedral Caverns —  |
| 2 ► American Samoa, Vaifanua County, Vatia — Vai'ava Strait — |
| 3 ► Arizona, Coconino County, Jacob Lake — Kaibab Squirrel Area — |
| 4 ► Arkansas, Fulton County, Mammoth Spring — Mammoth Spring — National Natural Landmark — |
| 5 ► California, San Bernardino County, Amboy — 92 — Amboy Crater — National Natural Landmark — |
| 6 ► California, San Bernardino County, Trona — Welcome to the Trona Pinnacles — ... a National Natural Landmark — |
| 7 ► California, Shasta County, Burney — Burney Falls — |
| 8 ► California, Siskiyou County, Mt. Shasta — Mount Shasta — |
| 9 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — A Priceless Gift — Garden of the Gods Park — |
| 10 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — Garden of the Gods Park — |
| 11 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — Time Frozen In Stone — Garden of the Gods Park — |
| 12 ► Colorado, Jefferson County, Morrison — Morrison Fossil Area — National Natural Landmark — |
| 13 ► Florida, Alachua County, Gainesville — Devil's Millhopper — Registered Natural Landmark — |
| 14 ► Florida, Collier County, Naples — What Makes Corkscrew Swamp Special? — National Natural Landmark — |
| 15 ► Florida, Wakulla County, Wakulla Springs — F-394 — Wakulla Springs Archaeological & Historic District — |
| 16 ► Idaho, Cassia County, Oakley — 344 — City of Rocks — |
| 17 ► Illinois, Monroe County, Fults — Fults Hill Prairie — |
| 18 ► Indiana, Crawford County, Marengo — Marengo Cave National Landmark — |
| 19 ► Indiana, Fountain County, Covington — Portland Arch Natural Preserve — |
| 20 ► Indiana, Porter County, Dune Acres — Dune Creek Watershed: What Makes It Special? — |
| 21 ► Indiana, Wabash County, Lagro — Hanging Rock — National Natural Landmark — |
| 22 ► Kansas, Ottawa County, Minneapolis — Welcome to Rock City — |
| 23 ► Missouri, Oregon County, Koshkonong — Grand Gulf — |
| 24 ► Missouri, Stone County, Branson — Marvel Cave — |
| 25 ► Nebraska, Grant County, Hyannis — Nebraska Sand Hills — National Natural Landmark — |
| 26 ► Nevada, Clark County, Overton — Valley of Fire — |
| 27 ► New Jersey, Somerset County, Franklin Twp — William L. Hutcheson Memorial Forest — National Natural Landmark — |
| 28 ► New York, Albany County, Albany — National Natural Landmark — |
| 29 ► New York, Monroe County, Fairport — Hart's Woods — |
| 30 ► Ohio, Ashland County, Loudonville — 6-3 — Clear Fork Gorge — A Feature of Ohio's Forests — |
| 31 ► Ohio, Champaign County, Urbana — Cedar Bog — |
| 32 ► Ohio, Champaign County, Urbana — 6-11 — Cedar Bog Nature Preserve — |
| 33 ► Ohio, Cuyahoga County, Walton Hills, Sagamore Hills Township — Tinker's Creek is Gorgeous — Cleveland Metroparks — |
| 34 ► Ohio, Fulton County, Archbold — Goll Woods — 100 Acres of Virginia Timber — |
| 35 ► Ohio, Greene County, Clifton — Clifton Gorge Marker — The Old Trail Head — The Obscure Marker — |
| 36 ► Oregon, Lake County, Fort Rock — Fort Rock State Park — |
| 37 ► Pennsylvania, Berks County, Kempton, Albany Township — Hawk Mountain Sanctuary — |
| 38 ► Pennsylvania, Carbon County, White Haven — Hickory Run Boulder Field — Hickory Run State Park — |
| 39 ► Pennsylvania, Erie County, Erie, Millcreek Township — Presque Isle — |
| 40 ► Pennsylvania, Fayette County, Connellsville — Connellsville — Trail Map and Points of Interest — |
| 41 ► Pennsylvania, Lycoming County, Jersey Shore, Watson Township — Glacier to Gorge — An Incredible Diversion — Pine Creek Rail Trail — |
| 42 ► Pennsylvania, Philadelphia County, Philadelphia, Logan Square — Wissahickon Valley — 1868 — Parkway Museums District — |
| 43 ► Pennsylvania, Philadelphia County, Philadelphia, Roxborough — Park Directory — Wissahickon Valley Park — |
| 44 ► Pennsylvania, Philadelphia County, Philadelphia, Wissahickon Valley Park — Forbidden Drive — 1869 — |
| 45 ► Pennsylvania, Philadelphia County, Philadelphia, Wissahickon Valley Park — Park Directory — Wissahickon Valley Park — |
| 46 ► Pennsylvania, Tioga County, Shippen Township — Pine Creek — Grand Canyon of Pennsylvania — |
| 47 ► Pennsylvania, Wayne County, Lake Ariel — Lake Lacawac — |
| 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 — |
| 50 ► South Dakota, Harding County, Reva — The Castles — |
| 51 ► South Dakota, Roberts County, Browns Valley — 547 — Ancient River Warren Channel — |
| 52 ► South Dakota, Roberts County, Sisseton — Sieche Hollow — |
| 53 ► Vermont, Lamoille County, Stowe — Mount Mansfield Natural Area — National Natural Landmark — |
| 54 ► Virginia, Page County, Luray — Luray Caverns — |
| 55 ► Virginia, Page County, Luray — The Beautiful Caverns of Luray — Welcome to Luray Caverns — |
| 56 ► Washington, Whitman County, Steptoe — 31 — Steptoe Butte — The Evergreen State — |
| 57 ► West Virginia, Greenbrier County, Caldwell — Confederate Saltpeter Works — Civil War Industrial Center — |