A faded reminder of what was once a common sight in London during the Blitz.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

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

Christ's blood preserved in a Belgian town.

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

Go surfing on this urban wave, "hacked" by local surfers.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

The first museum in the world devoted to sexual gadgetry.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Museum dedicated to the terror regimes of Hungary.

Once the home of a hermetic monk, this cave now houses a small church.

Budapest's Communist-era statues, banished to the suburbs.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This attraction was abandoned after the Chernobyl disaster.

The patron saint of spinsters grasps a container of dried blood.

This unique Renaissance castle was turned into a home for Nazi occultism.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

Statue of death tucked in the University of Medicine courtyard.

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

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

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.