We all see the same sky

I just came up with an interesting idea, which is a way to decide where to travel next. It is simple: just list the cities where you have visited and look up their twin cities on Wikipedia. Interestingly, some cities I have visited are connected. Then make a mind map. In doing so, you'll find some new cities that are twinned with cities you have visited. 

In my case, where I should visit next is Budapest, Kiev, Odessa, and Lviv, namely, Ukraine and Budapest.