Believe it or not, the Colosseum took less than ten years to build—which is pretty quick, considering how huge it is. When it was finally ready, Emperor Titus threw a massive celebration in 80 AD. We’re talkin’ 100 days of games—gladiator fights, wild animal hunts, the works. People loved him, especially after how he stepped up during the whole Mount Vesuvius disaster in 79 AD. It helped boost his popularity big time. His younger brother, Domitian, later stepped in to finish off some of the final details, like adding underground tunnels and extra seating. The place was constantly evolving—it wasn’t just built and done. It grew with the times.