The hidden lair of an alchemist rediscovered in a 2002 flood.

Two stunning 17th-century libraries and a cabinet of curiosities.

A church of bones, decorated with 40,000 human skeletons.

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

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Geological storytelling.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

This former quarry is now a picturesque gorge that hides a sunken lake.

A unique underground structure dating back to the 1st century BC.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

A slice of central Asia in the middle of Berlin.

Abandoned soda factory on a Cambodian roadside in a state of beautiful decay.

Open-air museum with a large collection of Soviet-era statues.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

A landscape decorated with enormous skull sculptures.

A living art gallery painted on a canvas of Monterey pine trees.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A once-secret library of Freemason history in Catalonia.

This cemetery features modernist statues as strange as its name.

Replica of Seville, Spains famous Giralda, a former minaret converted into a bell tower.