I spent a year in the Sinai as a UN Observer and wandered all over. Didn't see that fortress but found many, many ancient structures. Hard to believe they paid me to be there!
Figures the gov't would send you to the Sinai as a UN Observer, when the UN is located in NYC. /jk
Sounds like a great time. It's remarkable that such a dry area has had so much activity, even over that many thousands of years.