Castelo de Porto de Mós

The green-towered castle was originally a Moorish stronghold. Conquered definitively in 1148 by Dom Afonso Henriques, it was largely rebuilt in 1450 and again after the 1755 earthquake. These days it’s too pristine to be convincingly medieval, but is fun to climb around and has pleasant views across the valley to the Serras de Aire e Candeeiros. Stick around until closing and watch them lock up with a key the size of your forearm.