A third pylon leads on to the oldest parts of the temple, past obelisks added at the behest of Pharaoh Seti I and Queen Hatshepsut in the New Kingdom era.
The third pylon is a massive structure. 
mnli hypothesis: The third pylon is a massive structure.  premise: A third pylon leads on to the oldest parts of the temple, past obelisks added at the behest of Pharaoh Seti I and Queen Hatshepsut in the New Kingdom era.