PETRA, JORDAN- APRIL 2: The Al-Khazneh, or the Treasury, is illuminated in blue on April 2, 2016 in Petra, Jordan. Major landmarks around the world will be illuminated in blue for the "Lighting It Up Blue" campaign on April 1st and 2nd to raise awareness about Autism Spectrum Disorders (ASD) for World Autism Awareness Day. (Photo by Salah Malkawi/ Getty Images for Autism Speaks)
