This was one of the first (and last) university-built and operated nuclear reactors.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

One of the highest mountain passes in Europe has been ranked among the best driving roads in the world.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Salute the leader of the proletariat.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The site of the deadly Triangle Shirtwaist Factory Fire.

The former hotel where Tesla invented the radio.

A living archive of urban activism and space reclaimed.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

Ernest Hemingway was the first to sign this colorful wall covered in thousands of celebrity signatures.

This high-speed test track is popular with car manufacturers, speed freaks and orbiting astronauts.

The remains of 50,000 World War I soldiers rest under a towering arch overlooking the Alpine battlefields.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

A cone-shaped top and cylindrical body set this 900-year-old structure apart from other Italian bell towers.

This peculiar Italian elevator runs both horizontally and vertically.

Dynamite factory turned museum explores the history of explosives.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

The home of a neoclassical master is now a shrine to his chosen art style.

The towering Pinocchio stands 63 feet tall in the Italian village his creator frequented as a child.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.