Although I have never been in the Czech Republic I already thought so, just wasn’t quite sure. I know that there are many John of Nepomuk churches in the Czech republic but there are also some elsewhere. I think I remembered this church subconsciously form a class at university. Well… time flies… some 20 years ago or so…
Ah… just looked it up: the architects were Christoph and Kilian Ignaz Dientzenhofer - quite important.