This natural "sea of stones" was once used by the Romans as a quarry.

A taste of Middle Earth, in the middle of the Bayou City.

Mexico's largest collection of masks is found in the ruins of an abandoned convent.

A steamer run aground near Bimini lives a second life as a playground for scuba divers.

In paradise, feral pigs have claimed an island all to themselves.

The ruins of a fairytale castle with a tumultuous history stand high atop the mountains.

This former Cyprus flight hub is now a crumbling, abandoned ghost complex.

A crumbling ghost town with prime views of the dam that doomed it.

An ancient necropolis of magnificent tombs.

If your school was decorated with trippy graffiti, served ambrosial coffee, and was frequented by mimes, it might have been similar to this groovy cafe.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

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

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

Giant, friendly pelicans in Central London, the most unlikely of places.

An incarceration museum on the spot of possibly the oldest prison in England.

A little slice of Japan and its aesthetics in London's Holland Park.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Catacombs turned marketplace.

A hands-off space for graffiti artists to hone and display their skills.

One part local history, 99 parts gruesome haunted house.

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