Strange red rock formations that have been attributed to a higher power for hundreds of years.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Step back into the glory days of Florida's nascent tourism industry at this Gilded Age palace.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An epic sculpture depicting a wagon and straining oxen.

A tower devoted to — and modeled after — the Divine Comedy.

A bright little alley in La Boca is a part of tango history.

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

Mining caused an asbestos emergency in this small town.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An architect's childhood fantasy treehouse made real.

"Polynesia on the Plains."

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A historic arena where the Beatles played their first concert in the U.S.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

Art deco landmark on the outskirts of Washington, D.C.

Largest Roman Catholic church in North America.