Well, not exactly. An accumulation tank for a newly built hydroelectric power station in Slovenia. But hey, them walls are smooth and just right for a bit of fixed gear fun. There's lots more pics on the Muslauf blog, and thanks to Jack from The Bike Show for putting us on it...

Dave is a founding father of road.cc and responsible for kicking the server when it breaks. In a previous life he was a graphic designer but he's also a three-time Mountain Bike Bog Snorkelling world champion, and remains unbeaten through the bog. Dave rides all sorts of bikes but tends to prefer metal ones. He's getting old is why.