As a result, many people in America's largest cities rely on various forms of public transit to get around town, whether it ...

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

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, ...