BERLIN — The former West Germany’s most-secret place — an underground bunker designed to shelter the government in case of nuclear war — officially opened today in its new incarnation as a Cold War ...

For many years, the residents of the leafy town of Cochem in the German Rhineland went about their daily business with no idea they were living on a gold mine.

The enormous air raid bunker in Wilhelmsburg, Germany, was once part of the Nazi war machine. During World War II, it sheltered 30,000 Hamburg residents a night as Allied bombs fell, and men shot from ...