- A timber amphitheatre was built around 70 AD and was later replaced by a stone structure in the early 2nd century.
- The stone amphitheatre could hold around 7,000 to 10,500 people and is one of the largest amphitheatres in Britain.
- The amphitheatre remains were discovered in 1988 when the Guildhall was being renovated.
- Pieces of the eastern entrance into the arena, and chambers on either side.
- Part of the curved arena wall.
- A few well-preserved timbers drains can be seen beneath glass panels on the floor.