Castelo de Arraiolos
Nestled on a grassy hill overlooking the village, this medieval castle stands out with its circular walls. The interior has seen better days, especially around the two towers, but the ramparts are still pretty much intact and offer incredible views over Alentejo's countryside. In the middle of the fortress there's a 16th-century church that is occasionally open and has a small souvenir shop. You can drive here or walk from the village, but it's a steep climb.