This memorial park stands on the site of one of the largest mass executions of the Second World War.

A pair of connected skyscrapers form this symbolic gateway.

Ruins of a German Castle on top of a towering stone pillar.

Tall columns of volcanic basalt make up this improbable-seeming rock formation.

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

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

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

After the construction of a nearby cathedral obstructed the view, the oldest belfry in Belgium was more than doubled in height.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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

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

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

This Croatian computer club features such gaming relics as the infamous Virtual Boy and an 8-bit Pacman machine.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.