St Albans - Verulamium & Roman Wall

The first settlement on the site of Verulamium arose in about A.D.45. It was the first Roman municipium in Britain and, at the same time, its third-largest town. The ruins of this and a later settlement were used in Norman times as building material for St Alban's monastery. Excavation work undertaken from 1930 to 1940 unearthed the remains of a fortress, a Roman theater and a mosaic floor with a hypocaust heating system. Other finds are displayed in the adjoining Verulamium Museum in St Michael's Street.
The Roman Wall itself can be seen for free.