The ruins located within the walls of Peel Castle are those of the former Cathedral of St German. Like the structures throughout the castle grounds, the cathedral's roof is completely missing. Robert Anderson examined the ruins to determine what repairs were required to restore the cathedral, and he reported to the island's Lieutenant Governor in 1877. However, none of the suggested repairs were carried out.
There is a pointed barrel-vaulted crypt below the chancel, measuring 10 × 5 × 3 metres, sloping to the entrance at the east. There is a cemetery in what was once the cathedral's nave.References:
The city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.