The site of the climactic scene from the classic horror film is now a historic landmark.

An iconic Soviet statue of working-class people.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

This massive monument honors the first human in space.

Moscow's imposing monument to the Space Age.

Former headquarters of the KGB.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The world-record holder for the longest bridge stretching continuously over water.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Portlandia is the second-largest copper repoussé statue in the United States.

10,000 flowered plants bloom in the City of Roses.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

This colorful gate stands as an entrance to the walled city of Old San Juan.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The world's second largest single-dish radio telescope, once used to contact E.T.

What was once a unique system of urban elevators is turning into a mechanical ruin.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Relive a Polish uprising via an enormous, century-old cyclorama.

Steadily reminding Czechia of its past.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.