Flies can be pesky for sure, but when you take a closer look, many of them are quite beautiful! Flies are in the order Diptera, which includes not only those pesky house flies but horse-flies, crane flies, fruit flies, hoverflies, midges, and mosquitoes.
In this sampling of flies in Sinai, you see:
Top Left: Band-eyed Hoverfly (Eristalinus taeniops)
Bottom Left: Common Green Bottle Fly (Lucilia sericata)
Top Right: Hoverfly (Eupeodes corollae)
The other two images are unidentified fruit flies (Drosophilidae family).