More than a year after it first took to the skies, a solar-powered plane has completed an epic around-the-world journey without burning a single drop of fuel. The revolutionary, single-seat Solar Impulse 2 touched down Tuesday morning in Abu Dhabi, at the same airport where it embarked back in March 2015. Over the last 16 months, Swiss aviator Bertrand Piccard and fellow pilot Andre Borschberg took turns flying the aircraft nearly 27,000 miles, tallying eight world records along the way.