This type of amphitheatre, also known as the "collar field", was a place used by Roman slave owners to seek stimulation and see slaves and beasts kill each other to get pleasure. So the elegant appearance is actually full of blood and violence. Later, the opera was used to enjoy large-scale operas. More than 2,000 years later, it is still used for large opera performances or musical concerts. Each performance is available for 15,000 people. It is conceivable how magnificent it is, and it is a classic that is beautiful and practical. Rows of neat round arches, inside and outside layer layer. This is the typical characteristics of ancient Roman architecture. Looking at the heavy bricks, even if they are already broken, they still have to admire the ancient Romans as a nation with a great architectural artistic genius.