A crumbling hospital from the 1850s on Roosevelt Island.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Sniff the Titan Arum's rotting flesh.

Elevated freight railway turned wildly successful urban park.

A terrific purveyor of natural history objects and curios.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Banksy's image of a naked man dangling from the window of a sex health clinic.

Old Tudor home moved on thick iron rails to a new spot.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

The legend says that this English rock formation was once a hunter who was turned to stone by annoyed witches.

Legend says these rocks used to be hunting dogs, a story that may have inspired Sherlock Holmes' most famous case.

Flaming barrels of tar race through these village streets on Bonfire Night, a tradition that dates back centuries.

This antique prison is a tourist attraction with a sordid past.

This tangled English forest looks like something right out of a fairytale.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

These medieval tunnels provided water to the city above through centuries of civil war and plague.