What city is the UNESCO World Heritage Site that Gerard of Cremona did most of his work located in?
Gerard of Cremona: Gerard of Cremona (Latin: "Gerardus Cremonensis"; c. 1114–1187) was an Italian translator of scientific books from Arabic into Latin. Gerard of Cremona:  He worked in Toledo, Kingdom of Castile and obtained the Arabic books in the libraries at Toledo. Toledo, Spain:  Toledo was declared a World Heritage Site by UNESCO in 1986 for its extensive monumental and cultural heritage.
Toledo