Archaeologists have a discovered an ancient structure in the jungles of Mexico that may have been linked to the cult of a prominent Maya serpent deity. A team of researchers with the Mexican National ...

A mammoth bone structure discovered at a Russian dig site called Kostenski 11 has been radiocarbon-dated and found to be more than 20,000 years old -- potentially classifying it as the oldest circular ...

Enigmatic structures on Venus could reveal unexpected activity. These formations, called coronae, are massive circular to oval structures, measuring up to several hundred kilometers (miles) in ...

An outdoor play area sits at the heart of this ring-shaped concrete kindergarten in Puerto Rico, designed by local studio ...