From the World Heritage inscription:
This outstanding archaeological area contains such magnificent monuments as the Temples of Ramses II at Abu Simbel and the Sanctuary of Isis at Philae, which were saved from the rising waters of the Nile thanks to the International Campaign launched by UNESCO, in 1960 to 1980.
Both the Temple of Philae and Abu Simble have the distinction of having been recovered from the waters of Lake Nasser by UNESCO. Both temples have been preserved so well, that if you didn’t know they were moved from another location, you probably would never have guessed (other than the pile of dirt covering the back of Abu Simble). The two locations are over 100km apart and are some of the best preserved temples in Egypt.
The above photo is of Philae Temple which is just above the Aswan High Dam.