Nothing symbolizes the Roman Empire at its height or Rome in magnificent ruins more than the Colosseum. Built in 70 AD, it seated 80,000 people, boasted a retractable roof, underground staging devices, marble seating, and lavish decorations. It still serves as the prototype for the modern stadium. The complexity of its construction, the beauty of its architecture, and the functionality of its design made it the perfect place for massive crowds to congregate for the bloody spectacles it contained.