CNN iReport

Imagine the lights of major cities around the world suddenly plunged into darkness for an hour. Sound like the demented plan of a crazed super villain? More like Saturday night's observation of Earth Hour, a symbolic gesture to raise awareness of global climate change.

On a macro level, iReporters showed us landmarks and skylines going dark. TiagoFM captured the Eiffel Tower in the dark, while Kaaxz showed us before-and-after pictures of a castle in Stockholm, Sweden. Elsabe showed us Cape Town , South Africa, and we saw Dubai , United Arab Emirates, from sharadagarwa . Inside the U.S., we saw expatnyc 's footage of New York going dark (and PHAmanNYC 's assertion that it was a bit of a bust), MarieSager 's photos of the event in Los Angeles and NakedBoyNews ' images of Las Vegas , Nevada.

On a more micro level, ordinary folks grabbed their video cameras and took us into their candlelit households. TechyMom documented her hour without power in southern Atlanta, Georgia, on a video that gives a blow-by-blow view of an evening of eating ice cream by candlelight. (This was only for an hour, after all.) ChrisMorrow visited the W Hotel in San Diego, California, to watch the "W" darkened, and then went home to film her husband Marty with the dogs using her camera's night vision .

There were so many iReports from so many places using creative photography and video editing to show us the wide-reaching impact of Earth Hour. Check out our map to see where the lights went out. If you participated in Earth Hour, send us your photos and videos and take a look at what everyone else has sent. Comment below to tell us what you think.