The underground sanctuary of a mysterious ancient cult.

Architectureal fantasy quarter of Rome.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This ancient hydrological marvel is now the base of a modern outdoor cinema.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This series of Scottish caves has no clear purpose other than baffling historians.

A dark Victorian well house now plays host to mystical waters and pagan shrines.

The beloved fantasy novelist is buried near a church containing a whimsical etched glass window full of Narnia favorites.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

An eatery for UFO seekers on the Extraterrestrial Highway.

Water of undetermined depth has attracted rare fish and cult leaders alike.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A 140-year-old castle with underground caves hidden in San Francisco.

A psychedelic labyrinth on the San Francisco bay.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.