Egyptian temple Debod, as gifts to nations that had contributed to the preservation effort. Nevertheless, several other temples vanished beneath the lake. Today there are dozens of sites with substantial temple remains, although many more once existed, and none of the major temples in Lower or Middle Egypt are well preserved. Those that are well preserved, such as Karnak, Luxor, and Abu Simbel, draw tourists from around the world and are therefore a key attraction for the Egyptian tourist industry, which is a major sector of the Egyptian economy. Three temple sites—Ancient Thebes with its Necropolis, Memphis and its Necropolis, and the
Abu Simbel temples as a lasting monument to the king and his queen Nefertari, and commemorate his victory at the Battle of Kadesh. Their huge external rock relief figures have become iconic. The complex was relocated in its entirety in 1968 under the supervision of a Polish archaeologist, Kazimierz Michałowski, on an artificial hill made from a domed structure, high above the Aswan High Dam reservoir. The relocation of the temples was necessary or they would have been submerged during the creation of Lake Nasser, the massive artificial water reservoir formed after the building of the Aswan High Dam on the Nile River.