The mysterious 1,000-foot railroad tunnel in Clinton that helped build the massive Wachusett Dam creates an unsettling ...

The ghost town of Centralia offers a stark contrast to Pennsylvania's greenery. A fire that started hundreds of feet underground in 1962 still burns today.

Thousands of displaced Palestinians streamed back toward their abandoned homes on Friday after a ceasefire between Israel and ...

Beneath castles, cities, and fields lies one of the most mysterious tunnel systems of the Middle Ages. In this video, we explore who may have built it, what it was used for, and why so many questions ...

A 2,000-year-old tunnel once used by Roman emperors to slip into the Colosseum unseen will open to the public this month, ...