A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

A historic observatory precariously perched at the "Top of Europe."

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

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

This former insane asylum now holds a pathological anatomy museum.

The unusually large seat sits atop the base of a ruined temple.

One man's personal kunstkammer, museum and shop.

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

Bring out your dead (saints that have been festooned and bejeweled, so that we can parade them around the town)!

This natural "sea of stones" was once used by the Romans as a quarry.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

This German "living museum" is maybe a bit too immersive.

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

An ornate century-old elevator still connects the two halves of Bad Schandau.

After years of being casually peed on by humans, this tree is peeing back.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

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