The Inca have been betrayed by the mountains

I once had a city state in that situation right next to me. They wanted me to build a road to them, very frustrating that I couldn't make that happen.

I've played quite a few games and only seen this happen once where there was a city blocked off like that, though there have been maybe one or two other times where I've seen a few isolated tiles behind some mountains. I think it's safe to assume it's a rare glitch in the map script.

Qwerknus, can u save that map? Try using that map when BNW comes out.
@stealth bomber: that would have worked with dido and her stupid UA she did that with her massive army. There was like a mountain range in the middle and she just walked over it like here no time tomorrow. Very epic

One-city challenge? I'd re-roll, but it does have good potential if you can get out of there early.

Havent forgotten you. Just a bit busy, will get around to it