No one knows exactly how many documents Edward Snowden illegally accessed and downloaded while working as a contract employee for a National Security Agency (NSA) signals intelligence facility in Hawaii; some estimate as many as 1.3 million. As a contracted NSA systems administrator with top-secret Sensitive Compartmented Information (SCI) clearance, Snowden certainly had access to millions of classified documents. NSA officials claim the majority of the documents Snowden stole had little or nothing to do with domestic surveillance. But it is precisely the documents describing the NSA's purported domestic spying -- and those related to its surveillance of foreign leaders -- that have garnered the most attention. Here are 10 of them.