It provides consistent output and can lower energy bills. Major city set to tap into limitless underground energy source — ...

The ancient Roman city of Suasa may have contained one of Italy’s first—and largest—arts districts. Archaeologists uncovered ...

The man (not named in reports from the time) sledgehammered his wall and found a tunnel behind it, and beyond that, more tunnels. Exploration would later reveal it was an underground city up to 18 ...

A fatberg described as equivalent in size to a blue whale - the largest animal known to have existed - has been removed from ...

Credit: Youtube Helsinki’s underground city, built into solid bedrock, includes gyms, shops, and even a church. It’s designed to house 600,000 people in an emergency.

Officials have announced construction of the Music City Loop, an underground tunnel project by Elon Musk’s Boring Company, ...