First it was carved into the rock itself, facing the river. The last statue is the one that never sees the light. When the Aswan Dam was built, this was another site which was threatend by submersion. As a result it was moved up the cliffs to a spot now on the edge of the water. There is a door on the right of Ramses' Temple which will take you into a hollow concrete cave behind the temple.
Most people miss it, but it's definitely worth a peek.
Back in Aswan, the last part of my trip was a 3 day felluca trip down the Nile back to Luxor. These were 3 days spent watching the banks of the Niles go by with small visits at a couple other temples including Edfu. A truly relaxing experience, though I have to admit 3 days was one day too long. After that we caught the train back to Cairo and flew home. Egypt is definetly one of my favourit countries so far, and I'm sure I'll be going back that way at some point.