Gobekli Tepe in Turkey is an archaeological site that was built around 11,000 BC, making it one of the oldest known sites with evidence of significant construction by humans. The site consists of stone circles with large pillars weighing up to 20 tons each and standing up to 20 feet tall. It was built and used by hunter-gatherer societies for over 3,000 years before being deliberately buried around 8,500 BC. The types of images carved on the pillars, which include lions, snakes, and spiders but no depictions of hunting or wounded animals, provide clues about the character of these ancient cultures.