2-368-758 - Samuel Magal/Sites & Photos/Heritage Images

The Baths of Antoninus Pius at Carthage, Tunisia. The massive remains of the Baths of Antoninus Pius, which were the largest in the Roman world outside Rome, occupy an area of 1.8 hectares (4.5 acres). Built between 146 and 162, in the reign of the Emperor Antoninus Pius, they were extensively restored in 389 but subsequently collapsed, presumably as a result of a structural defect, and thereafter were used for centuries as a quarry of building stone. As a result all that remains is the walls of the basement story, which owing to the nearness of the baths to the coast had particularly deep foundations, and a stretch of masonry on the west side extending up both storeys.