Berenice

Founded in 275 BC by Ptolemy II Philadelphus, Berenice was one of the most important harbours and trading posts on the Red Sea coast from about the 3rd to the 5th century AD. Remnants of the ancient town, including ruins of the Temple of Serapis, are located just south of the present-day village. Excavations are ongoing; between seasons, archaeologists cover the site to aid preservation, so there's not much to see outside the wonderfully clear water.