(NBC NEWS) - Buildings and landmarks across the world were bathed in blue light as part of the annual autism awareness campaign.
The Empire State Building is lit in blue to mark World Autism Awareness Day on April 2, 2015 in New York City.
Architect Antoni Gaudi's famous La Basilica de la Sagrada Familia is illuminated in blue in support of families touched by autism in Barcelona, Spain.
The Great Pyramid of Giza in Cairo.
The Great Sphinx of Giza in Cairo.
The fountains in London's Trafalgar Square are illuminated in blue to mark World Autism Awareness Day.
La BaLa Torre Agbar in Barcelona, Spain.
The Mole Antonelliana landmark building in Turin, Italy.
The Cheng Huang Pavilion is lit in blue lights in Hangzhou, China.