Heers Castle built in the 13th century. Of its many owners, among the most notorious was Raes van Heers (1418–77), who was defeated and driven into exile by Charles the Bold at the Battle of Brustem in 1467. The castle, and the town of Heers, were laid waste by Charles's troops, although the castle was eventually repaired after Raes' death by his widow.
The family de Rivière d'Arschot lived here until the 18th century, when Barbara, daughter and heiress of the last Count, Henri de Rivière d'Arschot, became abbess of Herkenrode Abbey; on her death in 1744, the family became extinct.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.