Ponferrada Castle, also known as the Castillo de los Templarios, is a monumental medieval fortress in León province that exemplifies Templar military architecture. Constructed by the Knights Templar beginning in 1226 and completed by 1282, the castle commands over 8,000 square meters and features distinctive polygonal enclosures with double and triple battlements, turrets, and defensive chambers. Located at the confluence of the Sil and Boeza rivers in El Bierzo region, it served both as a defense post along the Way of Santiago de Compostela and as a royal residence. The castle's robust stone construction and strategic design represent some of Spain's finest medieval military engineering. Templars maintained the fortress until 1312, after which it passed into Crown control.