Castelo de Óbidos
The outer walls of the fine medieval castle enclose the entire town, and it's great fun to walk their circumference, viewing the town and countryside from above—but take great care as there is no inner wall or railing for the most part. Extensively restored after suffering severe damage in the 1755 earthquake, the multitower complex has both Arabic and Manueline elements. Most of the keep is now a pousada.