In Roman times, the area of Basel was a centre of Roman activity. There are well-preserved remains at the site of "Augusta Raurica" in the canton of Basel-Landschaft. Around 200 AD there were about 20,000 people living in this city, now part of the much smaller Augst. The remains are on display in an open-air museum. The museum attracts over 140,000 visitors per year. Many of these visitors are schoolchildren from other parts of Switzerland. The site of Augusta Raurica includes the best-preserved amphitheatre north of the Alps, and a reconstructed Roman villa.