This modern museum in the Fort George District provides an excellent overview of the story of Belize, told through exhibits housed in the country's former main jail (built of brick in 1857). Fascinating displays, historical photos and documents bear testimony to the colonial and independence eras, along with an exhibit on slave history and a new contemporary art gallery.
The Maya Treasures section, upstairs, is rather light on artifacts (most of Belize's finest Maya finds were spirited away to other countries) but there are some impressive examples of Maya jade, as well as some ceramics and sculpture. You'll also find plenty of informative models and explanations of the major Maya sites around the country. Other sections of the museum are devoted to Belize's coins and its insect life. The museum also has a good little gift shop.