Well, the select club of epic walls might get another addition: the Siberia Wall in the Altai Mountains. Today, the wall system is barely visible, but it must have been truly humbling in its time.

This week, meet a big-brained ancient human relative, hear a meteorite as it lands on Earth, spot a tiny kangaroo-like marsupial, and more.

His ‘Flying Kremlin’ Ilyushin 96-300 - equivalent to Air Force One - disappeared from radar screens over the remote Altai region in Siberia, after a flight from Moscow on Monday, New Year’s ...

This story appears in the July 2013 issue of National Geographic magazine. In the Altay Mountains of southern Siberia, some 200 miles from where Russia touches Mongolia, China, and Kazakhstan ...