The White House
When Google Maps and Google Earth first launched, 1600 Pennsylvania Avenue in Washington, D.C., was whited out. It was a short-lived attempt at national security protection and the blurring was lifted by early 2006.
Blurred or not, the White House is surrounded by multiple layers of security. According to ABC News, this includes windows made of bulletproof glass, alarms and infrared sensors along fencelines, armed security teams on the property grounds and teams of snipers on the White House roof.
Sources: Live Science