1. Actun Tunichil Muknal (ATM) is located in the Cayo District of Belize, near the town of San Ignacio. It is a popular tourist destination and is known for its impressive Maya archaeological site inside a cave. The cave contains ancient artifacts and human remains, including the famous \"Crystal Maiden,\" a calcified skeleton of a young girl.

ATM is considered one of the most important caves in the Maya world and offers visitors a unique and immersive experience. To access the cave, visitors must hike through the jungle and swim across multiple river crossings. Inside the cave, visitors can explore and learn about the ancient Maya culture and witness the incredible formations and artifacts left behind.

The cave also holds significant religious and ceremonial importance to the Maya people. It was believed to be a portal to the underworld and was used for sacrificial ceremonies. The remains found within the cave provide important insights into the Maya civilization and their spiritual practices.

2. The cave is open from 8:00 AM to 3:00 PM. It is advisable to book a guided tour in advance, as access to the cave is restricted and only authorized tour operators are allowed to bring visitors. You can contact the Belize Tourism Board for more information on available tour operators.

3. Ticket information and transportation details can be obtained from the tour operators in San Ignacio or through the Belize Tourism Board. The cost of the tour usually includes transportation to and from San Ignacio, the entrance fee to the cave, and the services of a knowledgeable guide. It is recommended to wear comfortable clothing and footwear, bring a waterproof camera, and be prepared for moderate physical activity.