Obidos. This castle is located in the town of the same name and becomes a prominent medieval fortress on a hill close to the river Arnoya, keeping to the present structure and so intact medieval design.
Óbidos Castle, Portugal. The name "Óbidos" probably derives from the Latin term oppidum, meaning "citadel", or "fortified city". The municipality had its origin in an early Roman settlement near the foothills of an elevated escarpment. Information from: http://en.wikipedia.org/wiki/%C3%93bidos,_Portugal