Where once there was a train station bathroom, there is now this German burger joint.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This man-made mound monument was built out of soil from all across the Polish empire.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

The 28-foot granite map plots the locations of 40 theaters in New York City.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

La Cara del Indio honors the Taíno chief who fought bravely against the Spanish invasion of Puerto Rico.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This tiny home was originally a narrow alleyway.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This half-finished "city of toys" was almost Italy's own Las Vegas.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.