This is a panoramic view of the underground structure at the Royal Alcázar palace in Seville. Los Baños de Doña María de Padilla or The "Baths of Lady María de Padilla" are rainwater tanks beneath the Patio del Crucero. The tanks are named after María de Padilla, the mistress of Peter the Cruel. It is situated at the Alcázar of Seville or the royal palace in Seville, Spain, built for the Christian king Peter of Castile. The Palace was registered in 1987 by UNESCO as a World Heritage Site