The ruins had been preserved for thousands of years, but now they're fading fast
Indian mathematicians were the first to treat zero as an equal
Gases from heavy fertilizer use are threatening the ecological balance of America's natural parks
For many, Chinatowns are an attraction to a city - and many cities boast about their robust cultural neighborhoods
Last year, mainland Chinese became the top tourism spenders, dropping $102 billion in destinations around the world
Shortly after the start of the Olympic torch relay, the flame was puffed out
Made up of solely selfies, the gallery attempts to explore how people see themselves
If and when Shanghai spills far enough into the countryside, Tianducheng and its neo-Classical apartments will be waiting
Most architects want everybody to see their buildings. But in South Korea, designers are working to achieve exactly the opposite: an invisible skyscraper
Follow in Darwin's footsteps, starting on San Cristobal Island and then venturing to Floreana Island and North Seymour Island
We know where they are and what they say, but everything else is all hotly debated
Last year, China threw away 2 million of them
Every time he tried to paddle off, the crocodile came really close to his boat and he had to turn back
These designs for tiny apartment-living are being put to the test
Area 51 now officially exists, newly declassified documents say
Native Americans created the carvings, which depict nature and geometrical motifs, though researchers still puzzle over their exact purpose and meaning
Additionally, men take up more space than women, and larger groups of people tend to take up less space per person by crowding together
Dozens of pieces of premiere European architecture are showcased in this three-and-a-half minute video
But even if the dogs do sniff out tiger and rhino parts, a system needs to be in place for fully prosecuting the criminals behind those goods
Mexico has its share of dangerous spots. But some parts of Mexico are just as unsafe as some parts of the United States, and some parts are safer
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