24 stunning photos of cities around the world turning their lights off to make a point.

On March 19, dozens of countries around the world observed the 10th annual "Earth Hour."

Famous landmarks around the world — and millions of private citizens — turned off their lights for 60 minutes at night to create stunning, rarely seen images of their cities.

1. Here's the Parthenon in Athens, Greece, with its lights on...

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environment culture climate change australia vatican city paris greece london china france eiffel tower indonesia current events science & technology kuala lumpur shanghai thailand earth hour parthenon athens petronas towers malaysia big ben houses of parliament palace of westminster sydney sydney opera house the vatican st. peter's basilica chain bridge budapest hungary wat arun bangkok trevi fountain rome italy jakarta national stadium beijing national stadium
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