A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Countless grotesque faces stare out from this eerie Prague art wall.

Abandoned Roman Catholic chapel abused by Satanists before being restored.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Eighty million natural history specimens call this gargantuan museum home.

Scattered throughout London are ancient remnants of the city's former bounding wall.

London's smallest police station is barely the size of a phone booth.

One part local history, 99 parts gruesome haunted house.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

An ancient burial ground believed to have been used for ritual sacrifice.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Monument to a suicide protesting the Soviet invasion.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The final resting place of the great navigator, or maybe his brother.

A New England curiosity cabinet, one hundred years on.

One car at a time please.