A castle built by an eccentric medieval enthusiast in rural Ohio.

The largest earthwork effigy in the world.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Abandoned silver mine strewn with wrecked and twisted structures.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

A deserted hodgepodge of experimental structures designed by nearby university students.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

A bizarre house filled with an astounding array of collections.

A rim-made reptile in North Dakota.