Today, people around the world will celebrate Earth Hour (@earthhourofficial) by turning off their non-essential lights from 8:30 p.m. to 9:30 p.m. local time. The event was conceived by the World Wide Fund for Nature (WWF) in 2007 as a way to raise awareness about climate change.

Iconic buildings and landmarks participate each year, offering a rare unilluminated glimpse at their exteriors. Be sure to tap the blue location text above for photos of the Sydney Opera House which went dark earlier. Are you participating? Share your photos with the hashtag #earthhour2013! Photo by @_siya_
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