The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

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

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

Venice's "Island of the Mad."

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

You can spend the night in Dr. Frank-N-Furter's castle.

A 200-year-old prison that now houses a peculiar crime museum.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

400-year-old garden, restored to beauty.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

This museum inside a museum tells the story of London's timepieces.

A historic arboretum and non-conformist, non-denominational park cemetery.

The remains of Crystal Palace Great Exhibition of 1851.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

This South London cemetery holds the remains of more than 15,000 people.

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

All that remains of a magnate's dream home is a historic gate and an abandoned public pool.

A long abandoned hospital building on the outskirts of NYC.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The loneliest island in New York.