Tughlaqabad Fort, largely forgotten, hides a mysterious underground tunnel. Once a grand 14th-century city, its ruins and ...

I explored the Los Angeles secret tunnels that are not open to the public. I walked around trying to explore the secrets of the underground tunnels of LA. Thank you for watching! Subscribe for more ...

Most people exploring a city focus on what’s above ground. But in several cities across the U.S., there's an entirely different story beneath your feet. These tunnels, ranging from historic ...

The underground tunnel system of Hukok in Lower Galilee provided escape for Jews revolting against Roman rule. A team of volunteers also recently discovered a stash of 22 deliberately hidden—and ...

Add Yahoo as a preferred source to see more of our stories on Google. Editor's note: The following story was updated with new information. Want to go an adventure — underground? Then add exploring to ...