From Valleywag:
So much for indexing all the world's information: There are at least 51 places you can't see on Google Maps. One of them is the entire country of Bahrain. Allegedly, the Bahrain's Ministry of Information blocked Google Maps from its citizens because it didn't want the local poors to see the private jets and residences of the Gulf statelet's riches. This got us wondering what sights our government has blocked citizens from viewing. We list five, below.
See the List
Related Reading:
In The Plex: How Google Thinks, Works, and Shapes Our Lives
Planet Google: One Company's Audacious Plan to Organize Everything We Know
Advanced Web Metrics with Google Analytics, 2nd Edition