Built to defend against a return of the Mongol invaders, Castle Hill is now regularly overrun by hordes of foreign tourists. The Baroque residences here were built in the Middle Ages for the well-to-do; later, before WWII, this area housed government offices. The German occupiers used the hill as their last stand during the WWII siege of Budapest; for years afterward, the area was little more than rubble. But reconstruction has brought back Castle Hill`s charm. Significant sites include Matthias Church and the Royal Palace.