Independence Rock Highway 220, 20 Miles Northeast Of Muddy Gap Casper, WY 82601 US Website Get Directions Details Wrapper Description Description Natural Landmark along Oregon Trail. Numerous travelers painted, carved or wrote their names in its surface over the years. Related Content Climb aboard a train at the Douglas, Wyoming Railroad Museum Take a road trip through Wyoming’s Bighorn Mountain Country. 7 Ways to Experience Yellowstone this Summer 6 Ways to Connect with Family in the Cowboy State