Tholos de Montelirio Monument · Castilleja de Guzmán, Comarca Metropolitana de Sevilla, Seville Megalithic monument from the Copper Age (around 3000 BC), part of the large Chalcolithic settlement of Valencina-Castilleja, one of the largest known sites of its period in Europe (more than 500 hectares). The dolmen complex of Valencina de la Concepción and Castilleja de Guzmán was entered with monument status in the General Catalog of Andalusian Historical Heritage by Order of 21 January 2003 (Official Gazette of Andalusia of 30 January 2003). Photo: Murillo-Barroso M, Peñalver E, Bueno P, Barroso R, de Balbín R, Martinón-Torres M (CC BY 4.0) What to see and do in Castilleja de Guzmán