No one is sure exactly how many documents Edward Snowden illegally accessed and downloaded while working as a contract employee for a National Security Agency signals intelligence facility in Hawaii -- some estimates have it pegged as high as 1.3 million. As a contracted NSA systems administrator with top-secret Sensitive Compartmented Information (SCI) clearance, Snowden certainly had access to networks and servers containing millions of classified documents.

NSA officials have claimed that the overwhelming majority of the documents that Snowden stole had little or nothing to do with domestic surveillance activities. But it is precisely the documents describing the NSA's purported spying activities at home and those related to its surveillance of foreign leaders that have garnered the most attention. Here are 10 of them.