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.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A tribute to the first human in space.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

A cluster of headless, armless sculptures looms within a popular Polish park.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

Special benches that play Chopin's music are scattered throughout his native city.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

This fairytale medieval church in Poland originally spent centuries in Norway.

This 13th century Gothic brick castle is the largest in the world by surface area.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

This imposing 20th-century castle was abandoned before it was ever completed.