A museum glorifying the life of Stalin, located in the city of his birth.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

The greatest real estate coup of all time.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

The most confusing clock in New York.

Salute the leader of the proletariat.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Rummage through this sunken ship, but leave your scuba gear at home.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

During the holidays, a vintage subway train whisks New Yorkers back in time.

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

Lie in a hammock where George Washington stood.

Mysterious 500-year-old tapestries depict a unicorn hunt.

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

More gold than anywhere else, ever.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

The celebrated eyesore created by starry-eyed sweethearts.

Former hunting lodge of a duke who was an avid collector of impressionist works.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Notorious artist squat renovated into legal studios.