St Catherines Monestry
St Catherines Monestry is at the base of Mt Sinai...if you climb the mountain then you'll surely pass the monestry.
I couldn't go inside the monestry because I was wearing shorts (our guide said it would be okay!)...but I was so tired after climbing Mt Sinai that it didn't really matter anyway. The monestry looked good from the outside at least... ;)