Question: What city is the UNESCO World Heritage Site that Gerard of Cremona did most of his work located in?
Sentence (from "Gerard of Cremona"): Gerard of Cremona is the most important translator among the Toledo School of Translators who invigorated medieval Europe in the twelfth century by transmitting the Arab's and ancient Greek's knowledge in astronomy, medicine and other sciences, by making the knowledge available in the Latin language.
Relevant evidence: No