https:// wwwnc. cdc.gov/travel (not hot-linked, note the spaces)
I was surprised to find out that CDC recommends Hepatitis A vaccine for people traveling to Eastern Europe and "village" Greece and Germany - even if infrastructure seems modern. (Hepatitis A vaccine requires two injections 6 months apart, so get started as soon as you think you might be going).
The CDC Travelers' Health website above is a useful resource, no matter where you're traveling. If the advice on the "traveler" side is "talk to your doctor," try entering your destination on the "clinician" side of the page to find out what your doctor's advice is likely to be.