A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Gargoyle head that brings good luck.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

This classic restaurant features a gorgeous mirror-clad room.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

Step back in time and witness the fall of Constantinople.

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

360° views of the city plus five floors of optical illusions and hands-on science.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Bridge that died in war and was resurected.

Bell tower juts out from a village buried under a lake.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

Statue of death tucked in the University of Medicine courtyard.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

A museum of magic with a Sadist past.