Yzman
Deity
I remember in one of my games the AI had a city that was surrounded by mountains on all sides except for one, which was a hill. That city was truly impossible to take until I got artillery. Even then it wasn't very easy.
I think Print Screen button will take a screen shot right? No need to hit F12.
As a side-note, apparently the steam hotkey F12 to take a screenshot is also used by Civ5 to quickload a save (nice one QA... given that Steam is mandatory this should have been caught), so I'll actually have to replay from turn 170. Is there any way to change Civ5's hotkeys?
I kind of want to play that save, though. It looks like a fun challenge.
It does seem incredibly challenging!
I guess you'd need to beeline straight to Optics so you can even explore, by which point you'll have to hope the AI hasn't grabbed the land near your capital... You could make it pretty much impossible to take your capital with a good navy though.