Stretching over 21,000 kilometers, the Great Wall of China is one of the most awe-inspiring man-made structures ever built. Originally constructed to defend Chinese kingdoms from invasions, it spans ...

Add Yahoo as a preferred source to see more of our stories on Google. Petra in Jordan stands as one of the most famous archaeological sites on the planet (Getty Images) You may have read about the ...

Add Yahoo as a preferred source to see more of our stories on Google. A herd of antelope graze near a giraffe in Botswana's Okavango Delta. Murat Ozgur Guvendik/Anadolu via Getty Images Botswana’s ...