No one knew that Chester had an amphitheatre until 1929 when a large curved wall was discovered while a boiler room was being built underneath Dee House. Parts of the western entrance, outer and arena walls and the arena itself were then unearthed. Angry protests at plans to build a road straight across the site were successful and the road now curves around the amphitheatre. Excavation work is ongoing at the site, which housed another Roman building before the amphitheatre was built in the first century AD.