http://en.wikipedia.org/wiki/Heliopolis_(ancient)
Also known in the Bible as the City of "On," Heliopolis or the "City of the Sun" is now buried beneath Cairo. Heliopolis was the capitol of the fabled land of Goshen. Its obelisks are now in London and New York. It was ransacked for building materials by Arab invaders, and robbed of its treasures by European invaders. Learning and libraries and a labyrinth are its legacy. Many Greeks learned here.