The Fitzwilliam Card Room in Dublin has a LAGgy/maniacal pot limit game that alternates rounds of Omaha and Hold Em. I think the blinds are 1euro/2euro but it plays much bigger than that. I also recommend their tournaments, some of which alternate rounds of Omaha and hold em. Dublin is a great city to visit as well.

If you go round the world you will probably end up in London at some point. Both the Victoria casino and the Gutshot club off pot limit Omaha. Neither are worth a special trip but London is a great place if you haven't been there.

Check out the recent thread on the Aviation Club in Paris, assuming you are travelling with some dress shoes to get in with!