There\r\nare three open-air swimming pools in Madrid, one Olympic-sized, one for children and\r\none intermediate. Piscinas Casa de Campo gets very crowded at weekends but are fairly\r\nquiet during the week. At certain times they are\r\nclosed off for OAPs or particular activities, so it's best to call\r\nbeforehand to make sure they are open. Facilities at Piscinas Casa de Campo also include\r\nchanging rooms, cafés and sunbathing areas. Topless sunbathing is\r\nallowed, and there is an informal gay area.