Meet the RQ-4B Global Hawk: a spy drone with a wingspan of 39.9 meters (longer than the wingspan of a Boeing 757). This unmanned aerial vehicle is powered by a Rolls-Royce F137-RR-100 turbofan engine. It has a cruising speed of 357 mph, max range of 14154 miles, and a max altitude of 60k feet.
The drone can survey as much as 40k square miles each day. The above video shows it in action. Gung Ho Vids has the full story.