Mammoth Cave National Park

Mammoth Cave National Park in Kentucky includes the most extensive cave system known in the world. More than 367 miles of cave passageways have been mapped, and there may be more miles still uncharted. The national park preserves this cave system along with Kentucky’s Green River Valley and the surrounding hills. Since becoming a national …

Independence Rock: The Register of the Desert

Independence Rock, a natural landmark along the old Oregon Trail, can be found near Casper, Wyoming. The rock was an important landmark for pioneers; it served as a campground and watering hole, and it marked their progress westward. Three main pioneer trails the Oregon, California, and Wyoming led past Independence Rock. Measuring approximately 1900 feet …