Genghis Khan

It's time to dust off those telescopes, because in just a few days we will have the opportunity to witness something that not many have, or ever will again, in the sky above us. The event may also be a sign of good things to come in 2021.

The northern segment of the Great Wall of China was built not to block invading armies but rather to monitor civilian movement, an Israeli archaeologist said on June 9.

When researchers fully mapped the Great Wall's 740-kilometer (460-mile), Northern Line, for the first time, their findings challenged previous assumptions.