Terra Sancta Monastery, Jerusalem

The archives at this Franciscan monastery include the official seal of every Pope beginning from the 13th century.

Also housed there are 8,000 letters in Arabic sent between the Vatican and Islamic rulers of the Holy Land since the year 1290. Digitized by Ardon Bar-Hama, the letters illuminate seven centuries of the complex relationship between Christian and Muslim leaders. The Vatican has initiated a research project to translate and archive the documents.