Moeche Castle was built in the 14th century by the Andrades Family. It has an octogonal groundplan, and its walls are 10 m high and 3 m thick. Its gatekeep is 18 m tall and it is the only part of the castle protecting its walls from the outside. It was under siege and taken by the Irmandinos uprising.
The Moeche Castle has been restored recently, but in order to visit the interior of the castle, you'll have to request the keys from the local town hall.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.