This tiny 100-gram bird, light as a feather, circles the Earth twice each year, making it World’s longest traveller

Over its lifespan of about 30 years, a single Arctic Tern may travel more than 2.4 million kilometres. That is the equivalent ...

An ongoing walk across the world in 25 photos

For over a decade, Pulitzer Prize-winning journalist and National Geographic Explorer Paul Salopek has woven a tapestry of ...