Donkeys lined up and ready to take tourists back to the top of the canyon: Definitely worth it, however, as there is certainly something special about walking through the canyon and seeing The Treasury building appear between the narrow walls with nobody else around. It does feel a bit like stumbling upon something that nobody has seen for centuries, if you ignore the tourist tat shops that is.
And perhaps the signs vying for a person's attention:
Historians do not know when the Nabataeans first started building Petra, but it flourished as an important trade center until the rise of Palmyra (due to Roman support) to the north in Syria around the mid 300s A.D. I was completely blown away by how much time and effort it must have taken to carve temples and tombs and homes and a theater out of the rock by hand -- especially because it is unclear why the Nabataeans decided to chip away at the rock for centuries. Evidence suggests that the first peoples in the region were cave dwellers and I like to think that the massive buildings were simply a result of "keeping up with the Joneses." Early McMansions, if you will.
Whatever their fixation with rock, the Nabataeans ability to control water certainly played an important role in the growth of the city (although I like to think that people came to see the beautiful colors and patterns of the sandstone).
Water conduits built into the rock are still plainly visible today, and I was struck by how effectively they had utilized natural lines to aid in the movement of water. It must have been quite an impressive site to enter the natural fortress-like city from the surrounding desert and see water running along canyon walls.