I don't have any first-hand experience, but here in the Czech Republic (not rich by any means, but still pretty up there) there are some places that have the re

I don't have any first-hand experience, but here in the Czech Republic (not rich by any means, but still pretty up there) there are some places that have the reputation of ghettos. They're mostly located in border areas, which had a sizeable German population a were annexed by nazi Germany. After World War 2, most of the Germans were driven out and "resettled" under the communist regime. Add heavy industry and mining activity sometimes destroying the original towns and you can see how the region might not be the most cheerful place. Someone also had the brilliant idea of moving all the Roma from a town to a separate ghetto, which turned out as expected. It's not that any city is altogether full of crime and poverty, personally I'd say they're just less desirable with full-on "crime and poverty" being noticeable only in some hotspots (but then again, I don't live there and only ever visit for short periods of time, so really all I can say is "it doesn't seem that bad").