River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

A monument to placate the spirits of an ancient forest.

This sculpture is an homage to one of the most important Jewish women in medieval England.

A 1980s tour bus that traveled millions of miles to facilitate a superlatively rigorous performing career.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Rejoice at Amsterdam's ‘pop temple,’ a former church reborn as a raucous music venue.

A legend says that if this elaborately decorated glass breaks, the good fortune of its owner's household will also disappear.

Reminiscent of a termite mound, this imposing structure is likely an ancient funerary monument.

An Asante king spent four years in exile in a house on this very spot.

A Nuragic tomb, a Roman tomb, and a Byzantine Church, all hidden inside a rock.

A reminder of the gruesome punishments delivered to those who were found guilty during Scotland's witchcraft trials.

A natural rock silhouette on Cape Elizabeth's scenic Shore Road, reminiscent of New Hampshire's "Old Man of the Mountain."

The ruins of a failed dam that was built over land later described as a "sponge."

A modern mini-Stonehenge is hidden in a public reserve, not far from a former Viking stronghold.

The home of two of Scotland's most important artists has been reassembled in the Hunterian Art Gallery.

Hike to the decaying remains of a dream house with a spectacular view.