A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

A forest of phallic offerings found in a quiet corner of a hotel car park.

Bangkok's men with dangerous jobs come here in search of protective talismans.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

A surreal museum of extraordinary industrial objects.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Abbey built on the ruins of Roman catacombs.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

Artworks by loners, prisoners and the criminally insane.

Terrifying derelict military hospital once housed a recuperating Hitler.