Fort Monostor was built between 1850 and 1871. After World War II the Soviets built the biggest ammunition storage in the Fortress of Monostor. Thousands of wagons of ammunition were forwarded from the strictly guarded objects. One of a series of forts in the area, Monostor is open to the public as a museum.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.