Castillo de Oropesa is Toledo's most emblematic monument, comprising a complex defensive system that layers Muslim fortifications from the 12th-13th centuries with Christian architectural additions. Built atop Roman ruins, the castle features a rectangular floor plan with four circular towers, of which two remain preserved, alongside notable structures like the Gothic-Mudéjar palace of Doña Elvira and the 16th-century palace of the Álvarez de Toledo family. The fortress boasts a distinctive stone staircase unique in Spain and a Tower of Homage offering panoramic views of Oropesa and its surroundings. Converted into the first Parador hotel in 1930, the castle exemplifies the blend of Roman, Moorish, and Christian architectural heritage.