@Elizabeth Marshrutkas are privately owned mini-buses that run specific routes that the city transport lines do not. They are slightly more expensive 1.50 leva versus 1 lev and they do not stop at designated bus stops you just tell the driver when you want to get off. Likewise, you can flag the marshrutka down anywhere on its route. Here's what <a href="http://en.wikipedia.org/wiki/Marshrutka" target="_blank" rel="nofollow">wikipedia has to say about marshrutkas</a>.