A fascination and interest in circles predates recorded history, with many ancient cultures finding approximations for pi—the ratio of a circle's circumference to its diameter—thousands of years before mathematicians gave it that name with the tasty homophone."
A focus on circles is evident among structures built throughout history. Although the meaning of its design is still being deciphered, Gobekli Tepe, a series of stone circles in Turkey, is the oldest known temple, built 6,000 years...