Monreale's cathedral, built by William II, dates to 1172 and is now part of a larger UNESCO World Heritage Site that also encompasses the Royal Palace and the Palermo Cathedral, among other sites.

On a hill overlooking the city of Palermo, in Sicily, sits a lesser-known gem of Italian art: the cathedral of Monreale ... They span over 6,400 square meters and contain around 2.2kg of solid ...