Na baště Svatého Jiří,
160 00 Prague-Prague 6,
I tried using utf-8 urls but I couldn't work out how to handle them in rails.
Actually, looking at the search term you entered, I must have a bug, because the iconv output is correct, it definitely shouldn't be stripping letters out of the url.
I could have used UTF-8, and made the URL http://archäologie-oö.info/orte/hörsching, but then all of the sudden 95% of the worlds population couldn't type that URL anymore.