I've met a number of people who are worried about traveling if they have food intolerances. I've traveled quite extensively over the last 20 years and have had mostly success. Traveling domestically can be easier because of the common language but many countries are much more food allergy aware than the US. I find that dairy in food is much more obvious and I can usually get around it with a couple of key questions ("Do you butter your grill?" for example). I also find that if a restaurant is up on dealing with one intolerance they are more receptive to dealing with others (sadly this isn't always true, but frequently it is).
|Southeast coast of Spain|
Gluten Free Restaurant Awareness Program - the grand-daddy of them all, this site lists and ranks GF restaurants that have gone through GFRAP training. Best part is a Zip Code search which will display results by distance from a particular zip code!
Celiac Handbook Restaurant List - Another list of restaurants by State. Again, you’ll need to investigate how close these are to where you are going to be.
The Association of European Coeliac Societies (AOECS) is an umbrella organization of national groups throughout Europe. Their list of member organizations (and web links to each) is here: http://www.aoecs.org/?id=-9 I've used the website of the association in Spain http://www.celiacosmadrid.org/ which was amazing, but didn't have much luck with the site for the association in Norway. At least it is worth a try.
My final advice would be to do a web search on key phrases (Celiac Disease, Gluten Free, Dairy Free, Allergen Free) and the name of the place you are going and see what comes up. And of course, you can always post a comment here and I’ll try to help!
Additional articles you may enjoy:
Dining Dairy Free / Gluten Free in Oslo, Norway
Eating Dairy Free / Gluten Free in Buenos Aires, Argentina
And if you're heading to the New Jersey area be sure to peruse this list of New Jersey Gluten Free Dining Options and for US trips see this list of Gluten Free Chains / Fast Food Restaurants.