Torre del Tostón Monument · La Oliva, Fuerteventura, Las Palmas A circular defensive tower built around 1700 by the engineer Claudio de L'Isle, on the ruins of the castle of Rico Roque raised by Jean de Bethencourt, to protect the port of El Cotillo from Barbary, English and French attacks. Declared a Monumento Histórico-Artístico, the heritage designation used in Spain between 1931 and 1985, in 1949. Photo: Frank Vincentz (CC BY-SA 3.0) What to see and do in La Oliva