Erchless Castle was built in the 13th century by the Bissetts and it came into the hands of the Chisholms. It was remodelled in the early 17th century as an L-plan tower house and underwent further alterations in the 19th century with the addition of a Baronial-style wing in 1895. During World War II the castle was said to have been requisitioned by the military for use as a rest centre for staff employed in entertaining the troops.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.