Abu Simbel in Egypt was saved from the rising waters of Lake Nasser growing behind the Aswan Dam in a massive archaeological rescue plan sponsored by UNESCO in the 1960s. The complex of temples dedicated to the Pharaoh Ramesses II "the Great" remain an evocative and unforgettable destination.
EgyptAir offers daily flights to Abu Simbel from both Cairo (NB: early morning flight, about 5.30 am) and Aswan (up to four flights daily). http://www.egyptair.com.eg/docs/Services/services2.htm
Abu Simbel is currently inaccessible to foreigners travelling by car, on account of police security concerns. The road from Aswan to Abu Simbel is open, however, to bus travel....
Foreign travellers can get to Abu Simbel by coach or minibus from Aswan, travelling in police convoys. There is at least one daily convoy each way - the number and frequency of these are often raised when demand increases. Travellers are advised to check at the Aswan tourist office before making firm plans.