Anfiteatro Romano de Mérida Monument · Mérida, Tierra de Mérida - Vegas Bajas, Badajoz Opened in 8 BC, with capacity for about 15,000 spectators, it was used for gladiator and beast combats. Adjoining the Roman theater, it forms part of the Archaeological Ensemble of Mérida, a World Heritage Site (1993). Photo: Elemaki (CC BY 3.0) What to see and do in Mérida