The sheer size of the massive cavern that allowed for such a huge city to be built was astounding within itself. But furthermore, was the fact that the structures within the city were all made with incredible care and detail.
Many of the large buildings boasted stone carvings with information that helped travel. Streets were named along with buildings numbered. It was much more detailed than most other cities since they would have to use wooden signs or other means to identify locations.
However, this all made sense. The underground city was limited to the space of the massive natural cavern that had once been just that, a natural cavern. Therefore, the utmost care went in to building every single little part of the city. Detailed plans to make sure they used the space as best as they could. That was why the organized sight of every single area made the entire group impressed. It was all too clear how much intelligence was needed to keep this place in such an ideal condition.
drop those golden tickets!