The amphitheatre of Londinium lies in the north-west of the Roman town. It was discovered near to the Guildhall in the City of London in 1988 as part of the development of the area prior to the creation of the new Guildhall Art Gallery.
The amphitheatre appears to date to c. AD 74 or 75 based on dendrochronology. One of the timbers from the seating had Latin markings. The structure was adapted in the 90s, and expanded, in stone, during the reign of the emperor Hadrian.
Some of the remains have been preserved (and scheduled) in the basement of the Art Gallery. Visitors enter from the east through the main entrance. The sense of space has been recreated by lit displays.
See here for an earlier guide to the remains of Roman London.