During World War II, this rice mill became a Nazi concentration camp.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

A massive marble foot is tucked away in a small alley near the Pantheon.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

An art installation memorializing a tram stop, which became a tram stop.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

These lights mark the area of Rotterdam that was bombed and burned in 1940.

A massive stone fox oversees a Rotterdam elementary school crosswalk.

An enormous Polaroid picture adds an artistic flair to Rotterdam.

This charming pup is meant to celebrate the youth and stubbornness of the city's students.

A huge teapot illuminates a home for the elderly.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

A sharp sculpture made of thousands of pieces of jagged glass.

2300-year-old Roman road connecting the empire.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

This dockworkers' lunch joint has been left leaning by a century of storm floods.