The interior is better preserved; beneath the arena are subterranean passages like those in the amphitheatre at Puteoli. It is one of the largest in existence; the longer diameter is , the shorter , and the arena measures , the corresponding dimensions in the Colosseum at Rome being 188, 155, 85, 53 metres (615, 510, 279 and 174 ft).
The interior is better preserved; beneath the arena are subterranean passages like those in the amphitheatre at Puteoli. It is ,one of the largest in existence; the longer diameter is , the shorter , and the arena measures , the corresponding dimensions in the Colosseum at Rome being 188 155, 85, 53 metres (615, 510, 279 and 174 ft).