evidence: Olivenza is a town located in southwestern Spain, near the Portuguese border, on a historically disputed section of the Portugal – Spain border. Its territory is administered by Spain as a municipality belonging to the province of Badajoz, and to the wider autonomous community of Extremadura. In 1964, Olivenza became one of the first municipalities in the province of Badajoz that earned a heritage protection status of conjunto histórico-artístico for their historic cores. The report for the declaration cited that the city of Olivenza, "surrounded by a beautiful landscape of pasture and farmland, dominated by the imposing castle’s keep", "offers a number of buildings, enclosures and places of notable importance in the monumental aspect". [...] Medieval Citadel and Alcazar. Olivenza’s fortress or castle preserves thick 14th-century walls, without battlements. The towers retain their machicolations. The keep, built in the reign of Alfonso IV of Portugal, son of D. Dinis, and reinforced in 1488 by order of Juan II of Portugal, measures 36 m high and 18 m on the side and has three floors, of which highlights the decoration of the latter. It is accessed by 17 ramps with a vaulted roof.