The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

This Stockholm light tower can be controlled by anyone with a smartphone.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

Metro station with a claim to rock n' roll fame.

A fascinating insight into daily life in the Eastern Bloc.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Floating swimming pool within a moored vessel.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

An old department store turned Nazi prison turned artist commune.

Started as a kitchen garden, now the second largest botanical garden in the world.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This classic restaurant features a gorgeous mirror-clad room.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Museum preserving torture methods from the past.

This basement museum explores the art and artistry of fascism.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Rising from the sea like a stone monster.

A submerged archeological park still holds the wonders of a Roman Sodom.

Northern Ireland's Brobdingnagian stepping stones.