It's hard to miss Óbidos Castle, given its immense size and grand position in this hilltop town. However, there's very little reason why you should ever want to. Beautifully well-preserved, it dates back to defences first put in place by the Muslim rulers of Óbidos before Portugal's first king, Afonso I, reconquered the region in the 1140s.
The castle was rebuilt again by King Dinis when he gifted the town to his new bride in 1282 as the traditional royal wedding present.