Subways

This alluring underground library, hidden in a suburban Metro station, features a Space Age aesthetic and its own hydroponic garden.

A pair of antique trolleys are on display at one of the oldest subway stations in the United States.

A dazzling work by a Pop art legend hangs in one of the world’s busiest subway stations.

The ruins of a medieval bridge are visible inside a Prague Metro station.

This mosaic commemorates the oldest subway tunnel and station in the United States.

Complex tile installations designed by a renowned Polish artist in a Warsaw subway.

A forgotten underground railway once whooshed trams beneath London.

A unique subway station where pillars evoke ancient civilizations.

Tucked away in a London Tube station, this 1920s linear clock shows the time across the world all at once.

This 40-meter waterfall of light graces one of the most iconic stations in the Madrid metro network.

This subway station is named after a local legend about supernatural dancing cats.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

The only airport with a people mover system designed by Walt Disney Imagineering.