Input (grade 13): The existing Aqua Claudia aqueduct was extended to supply water to the area and the gigantic bronze Colossus of Nero was set up nearby at the entrance to the Domus Aurea.
Output (grade 6): He had the Aqua Claudia aqueduct made longer to supply water to the area. There was also a big bronze statue of Nero, the Colossus of Nero, at the front of the Domus Aurea.