Italy and Austria are on the verge of completing the longest underground rail tunnel in the world. The €10.5 billion ($12.3 ...

An inventor in 19th-century New York had been dreaming about a subterranean railway for decades. He’d have to break a few rules to build it.

Cincinnati city leaders are exploring the possibility of transforming America's largest abandoned subway system, located beneath Central Parkway in downtown, into a unique public amenity.

In the quest for the Sanguire Rod, players must travel to a location called the Underground Music Venue in Fisch. Since there ...