Actun Tunichil Muknal (Cave of the Stone Sepulchre) dubbed by National Geography as the top sacred cave to explore in the world; should be on your bucket list! Your journey starts from San Ignacio in air-conditioned comfort with a 45-minute drive until your arrival at the ranger outpost. Here, our guides will provide you with a helmet, headlamp, and life jacket if needed. When geared up, it’s now time to hike, wade and swim the sacrificial Mayan underworld of the ATM. There’s 3 river crossing and a 30-minute hike, which will bring you to an hourglass entrance. From here, the cave system spans approximately 3 miles with stalactites, stalagmites, jarring boulders and fresh water streams from ankle to waist deep.The cavern ends with the main chamber where the calcified to sparkling crystalized remains of the “Crystal Maiden” lays, believed to be the skeleton frame of a young woman who was sacrificed in a bloodletting ceremony to the “gods”.