A brush maker used his factory to protect blind Jews from the Gestapo.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

One of downtown Berlin's last reminders of its Communist past.

A surreal museum of extraordinary industrial objects.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.

Macabre astrological automaton clock dating to the late 1400s.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

A rare chance to ride one of the few continuous elevators still in operation.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

This German fountain of a legendary apple wine-loving drink thief will spit on you.

Fantastic views and thousands of love locks.

Somber memorial to the May 10, 1933, book-burning which took place on this spot.

Carved fountains poignantly placed in parks and in front of special monuments.

Khmer Rouge's high security prison.

One of the biggest markets in Asia, under one of the continent's largest domes.

The largest mosque in Cambodia was built to unite the country's Muslim community but soon sparked division and controversy instead.

5,000 skulls in memorial to those killed by the Khmer Rouge.