Calleva Atrebatum (or Silchester Roman Town) was an Iron Age oppidum and subsequently a town in the Roman province of Britannia and the civitas capital of the Atrebates tribe. Its ruins are located beneath and to the west of the Church of St Mary the Virgin, which lies just within the town wall and about 0.5 miles (1 km) to the east of the modern village of Silchester in the English county of Hampshire.
You can still see the Roman wall from the city and the amphitheater just to the east.
In the NW corner an excavation is going on.
http://en.wikipedia.org/wiki/Calleva_Atrebatum |