Two Weeks in May 2023

Have you ever been to Europe?

Personally, this is too much travelling around for 15 days. Every time you move from one country to another, you'll lose at least one day. I could spend 15 days just in France or Switzerland because there's so much in each country. You couldn't go wrong with any of these, plus there's always Italy, Austria, etc. etc.

I'm looking forward to seeing all of the suggestions here.

1 depart - 15 fly home means 13 days of actual being in Europe. But depending on flight plans you could also lose a day to repositioning to get where you need to be to fly back home which now is at 12. You won’t likely do much on arrival day (day 2) so now you’re at 11 days. See what I mean?

You could possibly pull off 2 of these, but no not all 3.

May is not the ideal time to be in some parts of Switzerland. You may find that since it’s off season, some lifts may not be running and hotels may not be open for the season yet. You may encounter snow on the higher hiking trails. I’ve never read a review where someone hates Switzerland. Complained of how expensive it is -yes. Be forewarned and prepared for that so you won’t be disappointed.

15 days total only gives you 13 real days “on the ground”. Covering 3 countries gives you 3-4 days in each country, plus two travel days in between. Personally, I would limit it to 2 countries with 5-6 days each, plus a travel day. Or stick to one country and visit no more than 3 cities/areas.

Your interests: architecture, history, nature, food, museums and culture (I never know exactly what people mean by "culture"). Just about every large city has interesting architecture, some much more than others. I haven't been to the Loire Valley but French chateaux I've visited in other parts of the country are interesting. I say don't concentrate on them unless you are particularly interested in chateaux. More interesting are the various styles of monasteries and churches in Portugal, for example. Rural France is much easier by car. Are you planning to rent a car there?

History and museums and good food are plentiful in most European cities. For natural beauty, stay in North America. The Canadian Rockies and Alaska both have much more beautiful scenery than Switzerland. BTW I wouldn't call Switzerland or central France rugged, perhaps quieter. In the Rockies, you'll see wild animals. In Switzerland you'll see cows.

Just getting to rural France and Swiss Alps may eat up a lot of travel time. I would suggest sticking to places you can easily connect by rail. The historic centers of large European cities often have the ambience you may be looking for.

"France" (country) + "Switzerland" (country) + "Prague" (city)?

Yup, you have a lot of work left to do. Getting around, destination points, nights, etc..... long way to go.
One idea is to look for tours of those areas that interest you, then copy their itinerary.

Looking for medieval? Its there, but scattered except Prague where you will find about 150 acres (for comparison, DisneyLand is 500 acres). Of course Prague comes with something you dont want ... Party Night Life ..... and its good.