The principal attraction for visitors to Ban Chiang is its archaeological site (see pp58–9) . It was discovered by accident in 1966 by an American sociologist who tripped over some remains. The finds provided archaeological evidence that northeast Thailand may have been one of the world’s earliest centers of bronze production. Spearheads from the site are thought to date from around 3600 BC, while ceramics, dating from between 3000 BC and AD 500, testify to a high degree of technical and artistic skill. Today, a collection of these artifacts is on display, together with ornaments such as bangles and rings, at the Ban Chiang National Museum. A short walk from the museum, 1 mile (2 km) through dusty streets lined with quaint wooden shop-houses, two covered excavation sites lie in the grounds of Wat Pho Si Nai.