Assume you can stop in any time you like and have the option of fighting for good or just dropping in for a brief stay when the local evil is not tearing the place apart. Also assume that visiting a place entitles you to wander its surroundings as well–not just Hogwarts, but the wizarding world as a whole, for example.
Feel free to add any place you don’t see on this list. It was hard to know when to stop, and I know I missed a few.
Sorry, this particular visit will only go to one place. Our travel budget is not infinite.