The Aqueduct of the Miracles is the most impressive of Mérida's three Roman aqueducts. Built in the first century AD to carry water from the Prosperina reservoir into the city, around 800 metres of arches survive, striped horizontally in pale granite and red brick, rising in three tiers to almost 30 metres at their tallest. They march straight across the modern suburb of San Lázaro, the surrounding park preserved as open ground around them.
The aqueduct is a short walk from the old town across the Albarregas river, where you can also see a smaller surviving Roman bridge. Approach from the railway underpass on the western side for the dramatic angle. Free, open at all hours; floodlit at night. Bring a wide-angle lens if you have one.