A little over two years after landing, Curiosity has reached a milestone. NASA recently announced that the rover has arrived at the base of Mount Sharp, a 3.4-mile-high mountain that Curiosity has been heading towards since July of 2013. The initial landing was in Gale Crater, and the total journey has been around 9km or 5.5 miles — a number that becomes more impressive if you consider that Curiosity was designed to travel a maximum of 660 feet per day and navigate difficult terrain on its six wheels.