Alcázar of the Constables of Medina de Pomar Monument · Medina de Pomar, Las Merindades, Burgos Raised in 1370 by Pedro Fernández de Velasco, it combines two quadrangular towers joined by a central block; it houses today the Museo Histórico de las Merindades and is the most imposing civil construction of the north of Burgos. Photo: Fernandocacho (Wikimedia Commons) (Attribution) What to see and do in Medina de Pomar