The ATM Cave is most famous as an ancient archaeological site, containing the skeletal remains of Maya human sacrifices, pottery, and other ancient artifacts. Visitors go bananas over the fully intact skeleton from around 700- 900 AD that literally sparkles, thanks to time and science.You’ll hike to the location, wade across rushing rivers in waist-deep water, climb wet ladders inside a cave in just your socks, then enter a deep, dark hole in the side of a mountain because a tour guide told you to(and maybe pee yourself a little – but that’s okay!).