An unusual tunnel in Ohio has become an urban playground, drawing in skateboarding daredevils since the 1980s -- one of whom, ...

For a decade, one journalist’s investigation into suspected subterranean hideouts for fugitive Nazis has upended an entire community, split families, triggered excavations and lawsuits.

Discover Florida’s only underwater tunnel—the Henry E. Kinney Tunnel in Fort Lauderdale—an engineering marvel with decades of ...

The wartime tunnels are 2.75 miles (4.4km) long with 12 entrances. They were built to house 60,000 people a total of 21 metres (70ft) underground. Mr Pankhurst said: "They could sleep here or they ...