like section numbers at a modern stadium, the multiple entrances were numbered
underground holding areas for people and animals
one of several elevators that would lift from under the arena to the main floor
private tunnel entrance to Emporer's private box
iron pieces (above) held the stacked stone but over time most were dug out and scavenged for the metal to be recycled for other uses, creating the pocked pattern
We had a private tour guide for the day. He did a wonderful job leading us through, pointing out significant sights, and sharing history of what these areas looked like and how they were used at different times.
no climbing AND writing on walls