In what year was the cathedral, that Arnao de Vergara produced several windows for, registered as a World Heritage Site?
Seville Cathedral The Cathedral of Saint Mary of the See (Spanish: "Catedral de Santa María de la Sede" ), better known as Seville Cathedral, is a Roman Catholic cathedral in Seville (Andalusia, Spain). It was registered in 1987 by UNESCO as a World Heritage Site, along with the Alcázar palace complex and the General Archive of the Indies. "See" refers to the episcopal see, i.e., the bishop's ecclesiastical jurisdiction.
Royal Palace of Caserta The Royal Palace of Caserta (Italian: "Reggia di Caserta" ] ; Neapolitan: "Reggia 'e Caserta" ) is a former royal residence in Caserta, southern Italy, constructed for the Bourbon kings of Naples. It is one of the largest palaces erected in Europe during the 18th century. In 1997, the palace was designated a UNESCO World Heritage Site; its nomination described it as "the swan song of the spectacular art of the Baroque, from which it adopted all the features needed to create the illusions of multidirectional space". In terms of volume, the Royal Palace of Caserta is the largest royal residence in the world with over 2 million m³ and covering an area of about 235,000 m².