One of the most notable features of the world's largest cities is the way their lights look after nightfall. These lights burn brightly, making a beautiful sight, but also using up an incredible amount of energy. You can rely on these lights to shine nightly, hour after hour, 365 days per year with the exception of one hour--Earth Hour.

Earth Hour is a worldwide movement designed to encourage energy conservation. For one hour per year, the lights on major landmarks around the globe are darkened, generating international media attention.

This year, the event was held on March 23 from 8:30 to 9:30PM local time in many major cities. The lights went out on the Eiffel Towel in Paris, the Empire State Building in New York City, the Hiroshima Peace Memorial in Japan, Buckingham Palace in London, Petronas in Kuala Lumpur, Niagara Falls, the Los Angeles Airport and in many other locations around the world. More than 150 countries participated in Earth Hour in all. 

George Washington University and other a handful of other American schools that were on break on the 23rd will go dark from 8:30 to 9:30 PM on Saturday, March 30 in honor of the event.

Do you have an Earth Hour story to share? Post it in our "Comments" section.

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