If not... they have wallpaper screensaver photos from around the world. One of them is Wulingyuan National Park in China. Before I saw Wulingyuan on Apple TV I had never heard of the place... and it's so amazingly different that it looks like something not of this world. What I'm getting at is:

With places like that in the world... and there are many... it's not at ALL hard to believe that unknown tribes, towns, cities, could be plentiful and unknown to us.