Opened in 1846, the quarry boomed during the Industrial Revolution, when a 17,000-strong workforce extracted half a million tons of the gray rock per year to export across the globe. Today, only above ...

This new thrill ride from Go Below Underground Adventures sits in an abandoned slate mine 375 meters beneath the mountains of Wales' Snowdonia National Park. It became the deepest zip line in the ...

At check-in, guests receive a hard hat, head lamp, boots and a mountain guide. The journey — about 1,400 feet underground to the world's deepest hotel in the north Wales region of Snowdonia — takes ...

Welcome to the world’s deepest sleep—a hotel 1,375 feet underground, accessible only by hike, zip line, and flooded chambers. Deep Sleep is located in a disused Victorian slate mine below Snowdonia in ...

Ian Lee is a CBS News correspondent based in London, where he reports for CBS News, CBS Newspath and CBS News 24/7. Lee is a multi-award-winning journalist whose work covering major international ...