Tidal pools of Leça de Palmeira

The Tidal Pools of Leça da Palmeira is a public swimming pool on the beach of Leça da Palmeira in Matosinhos municipality, in the district of Porto, Portugal. The structures consist of two natural pools filled with fresh sea water, designed and built between 1960 and 1973 by Portuguese architect Álvaro Siza Vieira. It is one of Siza Vieira's early projects and it is his second design in Leça da Palmeira following his work in the Boa Nova tea room, located 1 kilometre (0.62 mi) to the north of the pools. In 2011, the pools were classified as a national monument and since 2017 they have been considered for UNESCO world heritage, together with the Boa Nova tea room and six other projects. The pools are also the only Portuguese building included in Thom Mayne's book 100 Buildings: 1900-2000. The pools are open seasonally between June and September and are operated by the municipal company Matosinhos Sport.