Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

This beloved American snack was conceived by a hungry coal miner.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

A Memphis park where you can walk the whole Mississippi River in one go.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Mile-long cave system near Great Smoky Mountains.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

An adorably sweet display of sculpted Precious Moments figurines.

For 150 years one family has been producing the iconic hot sauce on a bayou island made of salt.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

The world's longest known cave system.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

The world's largest collection of the world's largest objects is in one small Illinois town.

Learn all about this iconic air rifle without putting an eye out.

This mill has survived a tumultuous past to still produce flour and cornmeal.

The only brothel on the National Register of Historic Places.

People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.