The Colosseum was constructed with several different materials: wood, limestone, tufftiles, cement, and mortar. It looks more like a work of nature than man; for the regularity of art is lost, in a great measure, in dilapidation, and the luxuriant herbage, clinging to its ruins as if to mouth its distress, completes the illusion.
Vespasian's decision to build the Colosseum on the site of Nero's lake can be seen as a populist gesture of returning to the people an area of the city which Nero had appropriated for his own use. Much of the tumbled stone was reused to build palaces, churches, hospitals and other buildings elsewhere in Rome.
However, much larger concerts have been held just outside, using the Colosseum as a backdrop. I did not conjure up the past, for the past had already become identified with the present.
There is evidence for the existence of major hydraulic mechanisms  and according to ancient accounts, it was possible to flood the arena rapidly, presumably via a connection to a nearby aqueduct. Today A panorama of the interior of the Colosseum in The Colosseum today is now a major tourist attraction in Rome with thousands of tourists each year entering to view the interior arena.
Interior seating The raked areas that once held seating According to the Codex-Calendar ofthe Colosseum could accommodate 87, people, although modern estimates put the figure at around 50,