Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This shallow cave got its name from copious amount of human bones found inside.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Bizarre Cavern.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Why have you never heard of the second most popular tourist site in New York?

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Mile-long cave system near Great Smoky Mountains.

The Hudson River School comes alive at this palatial estate.

A century after his death, this covered bridge still calls to mind the plein air painter who loved it.

One car at a time please.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.

The filming location of a shark attack in Steven Spielberg's famous shark movie.

The world's smallest drawbridge.

Ruins of a once-prized railroad station in New York.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Once America's longest-manned military fort, now an abandoned hulk.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.