ROMAN THEATRE of VERULAMIUM
The Roman theatre at Verulamium is unique in Britain, because it's a theatre with a stage, rather than an amphitheatre. It was built in about 140AD, later redeveloped and by the 4th century it is estimated it could seat an audience of some 2,000. Close to the ruins are the foundations of shops and a temple. There is not a great deal to see, but it is opposite the Roman Museum - so park near the latter and combine the two.
Part of the Gorhambury Estate.