Faced with this pile of stones 2,000 years ago, I imagined the scene of the TV drama Spartacus in my mind. I still could not understand the role of the stone blocks on the playing field. The introduction says that this is not only a place for the nobles to entertain slaves, but also for the common people to enter the Colosseum for leisure and entertainment. At that time, there were few sports events. They took it as a stadium. To put it plainly, the Colosseum was today's Bird's Nest.