A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

An architect transformed this abandoned cement factory into his castle-like workshop.

Every winter, this former planetarium is transformed into a massive, brightly-lit Christmas ornament.

Stockholm's last remaining paternoster elevator.

Sound travels strangely in this underground whispering gallery.

This collection of 80 polarizing foods aims to challenge your subjective notions of repulsion.

Stockholm's deepest subway station is also a stunning ecological wonder.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

An icon of International Style architecture on the outskirts of Rotterdam.

Unknown to many, this is where items not displayed in a Dutch history of science museum are held.

A condensed piece of China floating in a Dutch harbor.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

This medieval castle was painted pink as part of a now-abandoned children's theme park.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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

Atop this former dutch railway office sits an interstellar work of art.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

An extraordinary museum devoted to the pop art legend created by Slovak artists.

This Parisian gem is one of the most incredible ethnographic museums in the world.

The history of radiation is on safe display at the foot of a radiation science laboratory.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.