Lago Martiánez Monument · Puerto de la Cruz, Tenerife - Valle de La Orotava, Santa Cruz de Tenerife A complex of seawater lakes and pools on the Martiánez coast, designed by the artist César Manrique and opened in 1977. It is declared a Bien de Interés Cultural (Spain's highest level of heritage protection) with the category of historic garden under the name 'Lago de la Costa de Martiánez'. 1977 Photo: Quartl (CC BY-SA 3.0) What to see and do in Puerto de la Cruz