The National Library Service maintains a central library in the Bliss Institute, a children's library, and a branch library in Belize City, as well as branches in all main towns and villages for a total of over 40 service points. The total book stock in 2002 was approximately 150,000 volumes. The Museum of Belize, opened in 2002, houses historical and cultural exhibits in a former prison. The remains of the ancient Maya civilization—the best known are at Xunantunich—are being excavated by the government. The Department of Archaeology in Belmopan houses artifacts thus far uncovered.