Subterranean

The aggressively banal name of this underground fortress of bureaucracy does little to evoke its truly surreal existence.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

The second largest in the world, this massive underground void has its own subway.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

One of the largest caverns in the world has a maw large enough to stack cathedrals in.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This subterranean necropolis holds three floors of antler-dug grave caves.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today.