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Reindeer change the color of a reflective layer in their eyes between summer and winter to deal with months-long stretches of Arctic darkness. These animals in Norway are cared for by Sami herders, the indigenous people of the region who have lived in partnership with reindeer for generations.

Postojna Cave in Slovenia is one of the biggest tourist attractions in the small country.

Young Xikxuvo Vakwë watches as a boat arrives on the Rio Itui in the Javari Valley. Collisions with outsiders have been catastrophic for the Amazon's isolated peoples—a fate Phillips and Pereira were working to prevent.

Indigenous rights advocate Bruno Pereira (with notebook) conducts research in the Javari Valley, home to the largest concentration of uncontacted tribes in the world.

For 50 years, Hans Island, a tiny chunk of land in the Nares Strait between Greenland and Canada, was at the center of an often surreal territorial dispute between Canada and Denmark. Officials from both nations took turns planting flags and bottles of whisky on the Arctic island.