Tower of los Monteros Monument · Espinosa de los Monteros, Las Merindades, Burgos A fourteenth-century fortification recently restored that recalls the Monteros de Espinosa, the corps that for centuries watched over the sleep of the kings of Castile and that gave the villa its surname. Photo: Eltitomac (Public domain) What to see and do in Espinosa de los Monteros