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People celebrate the summer solstice at the Kokino megalithic observatory, near the city of Kumanovo June 21, 2014. The 3,800-year-old observatory was discovered in 2001 in the northwestern town of Kumanovo, north from Skopje, and is ranked as the fourth oldest observatory in the world, according to NASA. (Photo by Ognen Teofilovsk/Reuters)
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