Cenotes

Cenotes are a type of networked, unmanmade well that can be found all across Mexico's Yucatan Peninsula. It's one of the most enigmatic natural formations we are aware of and was once revered by the Mayans. The cenotes themselves make up a large network of caves that has not yet been fully investigated, in addition to all the Mayan-era antiquities buried inside their depths.

The Yucatan peninsula is home to about 6,000 known cenotes, but that number just includes those that we are aware of. There are likely many more of these sinkholes across the area, along with brand-new ecosystems and life types that we have never seen before, according to cave divers.