For active outdoors enthusiasts, some days it feels like everything has already been done, nothing new remains, everything is meaningless and maybe you should just take up an indoor hobby instead. But wait! There is some good news: Caving (also alternatively known as spelunking in America and Canada, and potholing in Britain) has yet to be ruined by extreme sports bros and selfie-snapping tourists.
Better yet, there are an estimated 45,000 caves in the contiguous US alone (we're not even counting Alaska!), meaning there really is no limit to the amount of underground passageways available for you to explore if you don't have issues with the dark or with small, chest-constricting spaces -- which helpfully eliminates, like, more than half the population. Here we've picked out some of the coolest caves in the country to explore. Happy cave-diving, and don't watch The Descent before you head out there!