The Castle of Aguiar. once the administrative and military head of the Lands of Aguiar da Pena. witnessed the peculiar relationship that Man kept throughout this county's history with the natural resources provided by Nature. This fortification. prior to the nacionality. has an authentic natural fortress of giant granic balls as a base. overlooking the Aguiar Valley. reason for belonging to the category of rocking castle. The visit to this monument. which has been abandoned for five centuries. is done in a very idyllic environment due to the well preserved oaks that surround the castle and to the assiduous presence of the eagles of which the Lands of Aguiar are named after.