A small flooded ghost town with a few scattered structures remaining.

The ghostly remains of what was once the world's richest copper mine.

Odd outsider art installations surround a Gold Rush-era ghost town.

This picturesque Victorian ghost town was once a thriving mill community.

This abandoned nitrate town was repurposed as a dictator's prison.

A nearly abandoned 19th-century town on the Palouse.

This historic textile city was abandoned after being ravaged by fire.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

This tiny stone in a children's park is what remains of an ancient, once-worshipped object.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

An unusual "skull with ears" sits in the crypt of this small church tucked away at the end of a narrow alley.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A monument to the “unrecognized dead” of the tragic 1876 train crash.

The world's largest Our Lady of Guadalupe statue overlooks this Ohio sanctuary.

An abandoned tuberculosis hospital moulders on into an uncertain future.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

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

This advertisement for talcum powder was painted on the rock face and has since defied removal.

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

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

"Where the ducks walk on fish."

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.