Rough plan

1. 6/10 - Zurich
2. Lucern (Mt. Rigi). buy separate train tickets
3. Venice
4. Florence
5. 6/15 - Rome. e
6. Bari. e
   
7. 6/22 -Athens. e -ferry
8. Santorini
9. 6/26 - Istanbul. take night bus from Athens
   
10. 7/2 - Basel. take flight -easyjet
11. 7/4 - Belfort -Kanye West. car(?)
    
12. Barcelona. e
    
13. 7/13 - Paris for firework at Eiffel tower. e
    
14. Praha. e
    
15. Vienna. e
    
16. 8/3 - Brussels. e
    
17. 8/5 - Amsterdam. e
    
18. Interlaken
19. 8/12 - Zurich. e
    
20. 8/13 - ATL

Don't try to go everywhere, try to enjoy the cities I will be!