Almost the entire palace stands on rock. Structurally, it can be divided in four sections:
- the foundations and its enveloping walls, with two gateways (one of which is protected by a drawbridge)
- the restored structure of the old convent, and the clock tower
- the Arches Yard in front of the chapel, with its wall of Moorish arches
- the palatial zone and its cylindric bastion, with interiors decorated in the cathédrale style.
http://en.wikipedia.org/wiki/Pena_National_Palace