The ancient city designed to track time Keeping time was challenging for ancient civilizations, so this one built a city to do it. Facebook Prev Article Next Article Discover Checkout these cool gadgets... Related Posts Could Black Holes Made Of Light Power Our Spaceships? Why underdogs do better in hockey than basketball How Long Is One Second, Really? Ever Wondered Why Rivers Curve? The American Kilogram — Veritasium China spent $168 million to make it rain