My pick
My tip“Buy the combined ticket for all the sites. See a night show in July–August.”
One of the best-preserved Roman theatres in the world (16 BC), with a two-storey marble-columned facade. It still hosts the Classical Theatre Festival each summer within the Mérida archaeological complex, which is on the World Heritage list.
Address
Pl. Margarita Xirgu s/n, Mérida