The Outer Wall and the Flanking Tower, Loarre Castle, Spain, 2009 (photo)

Loarre Castle, designated a World Heritage Site in 2007, was built in the foothills of Sierra de Loarre and is the oldest fortified castle in Spain. The complex was built largely during the 11th and 12th centuries, when its position on the frontier between Christian and Muslim lands gave it its strategic importance. The Homage tower was built in an isolated position in front of the fortifications, to which it was connected by a wooden bridge. It contained a basement and five floors. After 1070, Loarre became increasingly important. In 1073, King Sancho installed a community of Augustinian canons, and it was from Loarre that he prepared for the conquest of Huesca in 1094. The Flanking Tower dates back to the 11th century. It stands on the left of the ramp at the entrance and was designed as a lookout for the security of the castle. The outermost walls were added in the 13th century.