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

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

The only road through the heart of Glacier National Park.

Spectacular views await visitors to this lake.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

Two dozen rescued bears roam (mostly) free at the largest bear ranch in the U.S.

A preserved stump is all that remains of the once-mighty hardwood.

A charming remnant of 19th-century fishing towns sits on Michigan’s Leelanau Peninsula.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

The world's longest known cave system.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This museum honors the composer of “Swannee Ribber.”

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

A sprawling maze of used books piled from floor to ceiling.

This monument claims to display the first pot used to cook a famed Southern stew.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Ruins of a Carnegie family mansion on Cumberland Island.