Acoustic metamaterials are a fast-evolving family of materials which manipulate sound waves in ever more advanced ways. Now, a team led by Changqing Xu at Nanjing Normal University in China has ...

Most people don’t expect this South Carolina trail to lead to a dark, abandoned tunnel carved into the mountain.

The 25 scariest tunnels in the world represent a chilling collection of humanity’s darkest passages. Each tells a story of death, desperation, or supernatural encounters that have earned them ...

Two ghost tours are planned for later this month at Allegheny Portage Railroad National Historic Site and Staple Bend Tunnel. The Spirits on the Summit tours are scheduled for Oct. 15 at the Allegheny ...