The USSR-built Plokštinė Missile Base once housed nuclear missiles aimed at Western Europe. Abandoned in the late 1970s, it’s ...

What looked like a peaceful, hidden lake turned out to be the entrance to a maze of underground tunnels. In this video, we ...

Watch as we construct a secret underwater house with a hidden underground passage using only primitive tools and natural materials. This project showcases survival skills and creativity in ...

Concealed for decades, a huge network of chambers beneath Rome’s Capitoline Hill is to be opened up to the public, revealing ...

Politics Secret passage under Lincoln Room floorboard inside US Capitol revealed by congressman – and it dates back to the 1700s By Ryan King Published May 11, 2025, 2:53 p.m. ET ...

From Boston to Denver, these cities have underground tunnels that you can explore, including this city in New Jersey.

Ground scans beneath the medieval fortification of Milan's Sforza Castle have revealed numerous hidden passages. Some of the tunnels were likely used by the military, while another once linked to ...

A STUNNING piece of Rome’s past has been uncovered after being sealed off more than a century ago. This network of dimly lit ...

The statement added that “some of which could be linked to secret passages of a military nature, also described in drawings by Leonardo da Vinci.” Use of ground-penetrating radar system.