Traces of the great Roman town of Verulamium, once second in size only behind Londinium, can be found here in Verulamium Park. Covering 100 acres (40 ha), the park features the remains of a Roman theatre and a 1,800-year-old hypocaust and mosaic. There's also an ornamental lake, which is home to many waterbirds.
Verulamium was a town in Roman Britain. It was sited in the southwest of the modern city of St Albans in Hertfordshire, Great Britain. A large portion of the Roman city remains unexcavated, being now park and agricultural land, though much has been built upon.