Take a journey into the Mayan underworld during one of the most unique experiences of your life. Actun Tunichil Muknal (ATM Cave) is an ancient archaeological site that contains the skeletal remains of Maya human sacrifices, pottery, and other ancient artifacts. The cave is not only geologically beautiful with its crystalline features, but it is also historically fascinating. The hike includes stream crossings in which you’ll wade across rushing rivers before climbing ladders inside the cave. This is one of the more difficult tours offered in Belize, but the effort is well-worth the experience.