aerial view of alcacer do sal medieval hilltop castle above the sado river in portugal with square towers, palace turned hotel

alcaiexcl cer sal islamic period portugal tourism portuguese conquest history reconquista sado river alentejo ancient civilizations archaeological site architecture battlements castle ruins chapels christian cisterns cultural experience heritage day trip defense discovery dungeons exploration fortification fortified walls fortress gatehouse hotel historic town historical landmark monument iberian peninsula medieval moorish museum panoramic views picturesque pousada ramparts roman empire scenic sightseeing strategic location stunning sunrise sunset tourist attraction towers travel