Gradiska
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Actually today Gradiška are three towns, very close to each other: Nova Gradiška ("new Gradiška"), in Croatia, on the highway, Stara Gradiška ("old Gradiška"), (also in Croatia, just on the border) and Bosanska Gradiška ("Bosnian Gradiška") on the Bosnian side of the border. This page is about Bosanska Gradiška, but maybe someday there's travelling information too about the other Gradiškas in the region
Get in
From Banja Luka, approx 8 marks, one hour, by bus.