Katowice's city-organised bike share system (available Apr-Oct) makes exploring the Silesian capital's concrete causeways and eclectic architecture easier than ever with 622 bikes found at 76 locations around the city centre including Katowice Rynek, the cultural zone, ul. Mariacka, Park Kościuszki and Park Dolina 3 Stawów (Valley of Three Ponds).
 

Bikes are available 24/7 but you have to register on their website first and have at least 10zł in your account to keep it active.  Log on to www.citybybike.pl/en to find out how it works and see a full list of bike locations.