Iran's folded rocks are a colorful formation that is part of the Greater Caucasus mountains, which formed when the Eurasian tectonic plate collided with the Arabian plate millions of years ago.

Under the ancient city walls of Tianxin Pavilion in Changsha, Hunan province, 26-year-old Ghanaian student Ako Nai Emmanuella Daniella bent down to touch weathered bricks engraved with Chinese ...