I'm a severe claustrophobe. After getting trapped in a slide in my local McDonald's at five years old, I swore off all tight and dark spaces forever. So it's not entirely surprising that I couldn't ...

Scientists first described the flooded cave in 2016 but determined its extraordinary extent years later. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Beneath the United States lies a surprising network of caves shaped over millions of years. Some feel almost otherworldly, with strange rock formations and the occasional glow from naturally occurring ...