The Alexandria Library, once the sun of the human civilization, is the highest representative of Alexandria's achievements, along with the Alexandria Lighthouse. The library was built in the 3rd century BC, and it is unknown what it really looks like. Today, one can only learn from sporadic records of historical documents, because it leaves not even a stone object; and a large number of archaeological excavations seem to have no conclusive clues. Today the Library of Alexandria stands on the site of the Ptolemy Dynasty Library, overlooking the Gulf of Haiselsay in the Mediterranean Sea.