In Macedonia, people look at the horizon from a rocky crest filled with astronomical markers at the megalithic observatory Kokino, which NASA ranks as the fourth oldest observatory in the world.
Robert Atanasovki/AFP/Getty Images
June 21, 2013 The solstice marks the longest daylight period of the year and the official start of summer. Revelers celebrated the marker across the globe.
June 21, 2011 Archival photos present a view of revivalist Druids celebrating the summer solstice at Stonehenge.
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