The pope (you know, this guy, the leader of the Roman Catholic Church) is pretty busy these days.

Photo from Chris Jackson/Getty Images.

Lately, he's been talking with international leaders, supporting indigenous people's rights, and retrieving his hat from mischievous children. Plus there's that whole being the head of a billion-person-strong religion thing.

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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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