This former quarry is now a picturesque gorge that hides a sunken lake.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Looming communist pillar with a Czech twist.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Walk through Czech history in Prague's largest graveyard.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

Volkswagen's dedicated museum dives into the complex history of one of the world's best known cars.

This gateway to subterranean Hanover plays jazz, pop and rock to surprised passersby.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

This tiny German village has staked claim to being the center of the union following Brexit.

A unique showroom for bathroom fixtures featuring a giant toilet observation deck.

One of two electrical towers in Germany that have a pathway constructed through the tower's legs.

A historic fire call point.

This giant glowing "beanpole" adds much-needed pops of color to an otherwise drab power plant.

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

Deep in the forest next to Augsburg are abandoned bunkers and bullet traps from the region's military past.

One of the largest busts in the world celebrates the German city's erstwhile namesake.

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

One of the only spherical 19th century gas containers left today.

This decommissioned nuclear power plant offers tours of its Communist-era control room and reactor hall.

This former Soviet military base has over 10 original aircraft and an enormous amount of memorabilia on display.