An abandoned boat that's been stranded mysteriously for decades.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Catacombs turned marketplace.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

Rebuilt remains of a temple to Roman god Mithras.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

One part local history, 99 parts gruesome haunted house.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

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

This banal Parisian entranceway is not what it seems.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

BDSM, 1930s Style.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

A font of vintage porn on the silver screen.

How did a French journalist’s grave become the sexiest statue in the cemetery?

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

Indents in the pavement are all that remain from a grisly death machine in Paris.