hello, i've recently become a member of the czech smokestack climbing union, so if you're in brno and are interested in trying something unorthodox, viewing the city from a different perspective, taking some cool pictures etc., contact me - i'm looking for new people to climb with. you can get a picture of what it's all about here: http://kominari.cz/galerie/fotogalerie.php
The photos on the website are fairly self-explanatory. Smokestack is, I think, an American English expression for chimney. And Fabik, we have an expression in the North of England "Not for a gold clock!"
Yeah, I kind of suspected smokestack was American, but I couldn't find any other good word to clearly differentiate it from ordinary chimneys on rooftops or from the rock climbing technique called chimney climbing.