Next to the alcáçova (citadel), this interpretation centre is an accurately sized replica of an Islamic residence dating from the 12th century. Key features include an open central patio with a rainwater collection tank in the centre, small sleeping alcoves, a storage area, kitchen with fireplace and a toilet that was linked to the sewers that emptied outside the town walls.
Indeed this primitive indoor plumbing was a major advancement (little seen elsewhere in Europe at the time), and a feature that would disappear from Mértola houses for many centuries after the reconquest.