This cave column thousands of feet below the earth’s surface is rightly named for one of the most colorful park rangers in history.

One part antique store, one part curiosities hodge-podge.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

An institution that preserves the history of institutionalization.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

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

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Wedged between two sets of row houses is an awkwardly located family graveyard.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

A memorial to the most decisive Native American victory of the Plains Indian War.

A large, historic railroad trestle over the Columbia River is now open for non-motorized traffic.

A nearly 200-year-old Catholic mission built to serve the native people of Idaho.

Cross the Continental Divide through an old railroad tunnel, and ride back to the top on a shuttle.

Garments from across the globe call this hidden gem home.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The romance of early commercial flight still fills this Art Deco destination.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

Engraved in stone here are the signatures of everyone who signed the Declaration of Independence.

Decades before the scandal, this staircase on the river was a literal "water gate."

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

Willy Wonka would love this weird half-a-home.