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.
Solar Impulse 2 begins its round-the-world journey as it takes off from Al Bateen Airport in Abu Dhabi on March 9, 2015.
Since its take-off, the plane has made 16 stops across the world without using a drop of fuel.
Pilot Bertrand Picard took this photo from the cockpit of the Solar Impulse during the second leg from Muscat, Oman, to Ahmedabad, India, on March 10, 2015.
The aircraft is uniquely powered by 17,248 solar cells that transfer energy to four electrical motors that power the plane's propellers.
Solar Impulse takes-off from Varanasi, India, on its way to Mandalay, Myanmar, on March 18, 2015.
The plane's wingspan stretches 236 feet to catch the sun's energy.
Solar Impulse 2 takes-off from Mandalay to Chongqing, China, with Bertrand Piccard at the controls on March 30, 2015.
Solar Impulse 2 departs Hawaii on its way to San Francisco on April 21, 2016.
The pilots faced a nine-month delay after the plane's batteries were damaged during a flight from Japan to Hawaii.
Solar Impulse 2 flies over the Golden Gate bridge in San Francisco on April 23, 2016, before landing at Moffett Airfield following a 62-hour flight from Hawaii.
Solar Impulse 2 takes off from Phoenix Goodyear Airport on its way to Tulsa International Airport on May 12, 2016.
Pilot Bertrand Piccard shot this photo over Holbrook, Arizona, on May 12, 2016.
The carbon-fiber plane is a single-seater aircraft, meaning its two Swiss pilots — Piccard and Andre Borschberg— had to take turns flying solo for long days and nights.
Solar Impulse 2 prepares for take-off on May 21 in Tulsa, Oklahoma.
At around 5,070 pounds, the plane weighs about as much as a minivan or mid-sized truck.
Solar Impulse 2 prepares to land in Abu Dhabi to finish the first around-the-world flight without the use of fuel on July 26, 2016.