On the left bank of the ancient Gauja River valley, between the Paparžu ravine and the ravine along which the Sigulda-Turaida road passes through the valley there are the ruins of a castle built by the Order of the Brethren of the Sword.  Construction on the castle began in 1207, and three decades later, in 1236, the castle was rebuilt for the needs of the Livonian Order.  The Sigulda Castle suffered much damage during wars in the late 16th and early 17th century.  During the Great Northern War, it was burned down and never restored.  What is there today is the south-western segment of the castle's convent building, as well as the tower of the main gate.  Beyond that is the internal forecastle, where there is an open-air stage for the annual Sigulda Opera Music Festival and other public events.  There are also impressive views of the ancient Gauja River valley, Krimulda and Turaida.  Reconstruction of the ruins is currently ongoing, and after the work is completed a second tower on the left side of the stage will be available to visitors.  The plan is to install crossings around the walls of the convent building.  Presently the ruins are available on a 24/7 basis and free of charge, but after the restorations are completed in 2012, admission will be charged.