Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

This cubist Vienna church building looks like some sort of alien stonehenge.

The beautiful baroque library of the Hapsburg empire.

The excellent Swiss museum of witchcraft is led by a modern witch.

A rare, flower-shaped example of Brutalist architecture in Switzerland.

A mythically themed self-built sculpture park.

Caves famous for the dragon-slaying saint who lived there.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

An alien landscape on the banks of the Aegean Sea.

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

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

A Japanese video game arcade hides in the back of a Swedish pool hall.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

The world's only museum devoted to the wonders of fluorescence.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

The most visited, and possibly most controversial, museum in Germany.

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

A slice of central Asia in the middle of Berlin.