During World War II, about 200 concrete bunkers for Nazi soldiers were built along the Danish coast. Denmark's largest was the Tirpitz Bunker, which measured 7,500 square feet and was located in ...

When the world starts to wobble, some people grab flashlights. But the rich ones dig deep into the Earth and emerge with subterranean sanctuaries built like Bond lairs. For the wealthiest, bunkers ...

Given its size, you may think the U.S. leads the way when it comes to nuclear bunkers, but America can't hold a candle to ...

Hamburg built more bunkers during World War II than any other city in Germany. Tour guides share the many stories of each one, with some of them rebuilt as cafes and bars while others serve as hotels.

The U.S. bombers that attacked Iran's nuclear sites dropped GBU-57 Massive Ordnance Penetrators, bunker-busting bombs designed to destroy hardened underground targets, for the first time in warfare.