The Amphitheatre of the Segóbriga Archaeological Park is one of the most impressive buildings on the site. Built between the 1st and 2nd centuries AD, this amphitheatre could seat around 5,500 spectators. It was the largest building in the city and was used for gladiator shows, animal fights and other public events.
The amphitheatre has an irregular elliptical shape, with a length of 75 metres and an arena measuring 40 x 34 metres. Despite having been looted over the centuries, its good preservation is partly due to the fact that it was used as a granary and corral for animals.