In the 1st century a.d., the Romans selected a hillside location to build this three-level complex that dedicated a floor each to worship (the top level), government (the middle level), and the circus (the lower level). The well-preserved circus, with a capacity of 30,000 spectators, is the most visited and evocative part of the site. It was used for horse and chariot races, and it’s still possible to imagine the winners exiting through the grand, arched Porta Triumphalis.