1. Altun Ha is an ancient Mayan city located in Belize City, Belize. It was one of the major trading centers during the Classic period of Maya civilization. The name Altun Ha means \"Rockstone Water\" in the Mayan language, referring to the numerous freshwater wells found in the area.

The most famous feature of Altun Ha is the Temple of the Masonry Altars, also known as the Temple of the Sun God. This temple stands at 54 feet tall and is one of the largest man-made structures in Belize. It is believed to have been used for religious ceremonies and sacrifices. The site also contains several plazas, residential areas, and other structures.

Altun Ha gained international recognition when a jade head carving of the Mayan Sun God Kinich Ahau, weighing almost 10 pounds, was discovered in the tomb of a Mayan royal in 1968. This iconic jade head is now a national symbol of pride for Belize and is featured on the country’s currency.

2. The Altun Ha archaeological site is open to the public for visits. The working hours are usually from 8:00 am to 5:00 pm. It is recommended to check with the local authorities or tourist information for the most up-to-date information on working hours. As for a phone number, it is best to contact the Belize Tourism Board or a local tour operator for more information.

3. To visit Altun Ha, there may be an entrance fee. The fee includes access to the site and the services of a guide. The exact ticket prices may vary, so it is advisable to check with the local authorities or tour operators for the current rates.