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

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

DEEP in the forests of western Lithuania, a chilling relic of the Cold War still lies hidden — a secret underground nuclear ...

We discovered a hidden tunnel that runs directly beneath the city – and what we found inside was unreal. In this video, we explore its dark corridors, forgotten chambers, and the eerie silence ...