An 11th-century medieval castle cascades over the town of Numão.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

A charming flea market shop dedicated to retrofuturistic apparati.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

A museum of magic with a Sadist past.

This massive library holds what was once the largest book collection in the world.

Inside a former cabaret, seven floors of erotic art.

A font of vintage porn on the silver screen.

France's national museum of scientific and industrial instruments.

Museum dedicated to the terror regimes of Hungary.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

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

Oldest Museum of the Netherlands is a true cabinet of curiosities.

A surreal museum of extraordinary industrial objects.

A slice of central Asia in the middle of Berlin.

A unique seaside cave where Aleister Crowley faked his own death.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This massive chapel in the middle of the Indonesian forest is both haunting and fowl.