This thang is old.
Over 3000 years old to be exact. It probably helps a lot since Damascus is apparently the oldest, most continuously inhabited city. On earth. Unfair advantage Damascus.
Being so old, the eighth century mosaics aren't all that unexpected. But whatever. If visiting you should probably check those out.
Coolest thing about this place: most people believe that the head of John the Baptist is buried here. (Everyone loves a man who wore animal hides and ate bugs.) Pilgrims to the site like to press there heads against a grate that they believe is over the head and apparently experience prophetic visions.
I'll believe that when I see it.