The best known of these facilities is Beijing's Underground City.

The Underground City was designed to withstand either a nuclear or conventional attack.

The official tour took visitors only on a small circular stretch of the Underground City.

On a much smaller scale, this segment is somewhat reminiscent of Montreal's Underground City.

"And I imagine you know that German troops move about out there and monitor the Underground City."

Whether this was the goal of the leadership of the Underground City or not mattered little to him.

Beijing's Underground City, built from 1969 to 1979, was later converted to underground shopping centers and museum.

Panicked, she turned around and headed back the way she had come, back into the bowels of the Underground City.

A maintenance worker had found it lying in the dirt where she'd dropped it in the Underground City.

On this island, they discovered the ruins of an Empyrean catacomb, which came to be known as the Underground City.