The world's first round-the-world flight to be powered solely by the sun's energy made history on July 26, 2016, as it landed in Abu Dhabi, where it first took off on an epic 25,000-mile journey that began more than a year ago.

ABOVE: Solar Impulse 2 flies over the Sheikh Zayed Grand Mosque in Abu Dhabi during preparations for its round-the-world flight on Feb. 26, 2015.