How to visit other people's capital?

[:1]I read you can buy stuff from other people's capitals. Do they show up on the map somewhere? I'm only level 5. Do I have to be a certain level first?
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Ok I figured it out on my own.

In case anyone wonders you can right click on people's name in chat to see a menu. One of the options is to view their city, but they have to be on the same server as your capital. It makes it hard to find cities on your server, but I was able to find one with lots of trial and error. I assume you can do this with people on your friends too.