One of the steepest streets in the United States makes an intriguing challenge for cyclists.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Salute the leader of the proletariat.

This Central New York ghost town was once a prosperous railroad community.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

A bronze sculpture of Lenin’s likeness outside Havana surrounded by 12 human figures in solidarity with the Bolshevik Revolution.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Could it have picked a better place to land?

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A monument celebrating the idea of reaching inaccessible places.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A museum in the former home of Marxist revolutionary Leon Trotsky.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

This university transit system is a 1970's vision of the future.

The little-known final resting place of one of America's greatest writers.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

An abandoned stretch of highway, deteriorating next to the operational one.