Researchers have uncovered hidden underground tunnels beneath Milan’s Sforza Castle, revealing a new chapter in the city’s ...

A third camp says the tunnels may have existed — anything is possible, really — but any subterranean structure has long since filled in, caved in or been in other ways irreparably damaged and lost to ...

Billionaire entrepreneur Elon Musk's mysterious tweets about tunnels have sparked a flurry of speculation about his next project -- and he apparently did some research last week in D.C. The founder of ...

PEMBROKE PINES, Fla. (AP) — The FBI and local police are investigating a Miami-area mystery: Who dug a narrow tunnel that burrowed beneath a road and pointed toward a quiet suburban bank branch office ...

Sinkholes are not unusual in Florida. Tunnels are a different matter. The FBI is investigating the discovery of an underground tunnel that appears to lead to a Chase bank in Pembroke Pines, the ...

Toronto police said Monday they now know who dug a tunnel near a major sporting venue in the city -- a mystery that has been a source of widespread speculation and conspiracy theories. In a statement, ...

As he was watering the lawn of his West Texas home, a hole opened in his yard. The sprinkler ended up in a tunnel that had collapsed. Now, Texas Tech historians are trying to figure out what's beneath ...