Hello - my family (husband, myself, 2 sons aged 20 and 22) are planning a vacation in Europe for 3-4 days enroute back to the US from India. We are looking for some recommendations to visit a European city. We have already visited Amsterdam, London, Paris, Rome, Florence, Istanbul and Zurich. We are considering either Munich, Venice, Vienna, or Salzburg. Our interests are natural beauty (outdoors), history, culture, etc. We are aware it would be mid-summer, so likely hot.
Any recommendations would be much appreciated. If you think any other city would be a better option, please chime in. Thanks in advance!
P.S. - I had posted this a bit earlier, and there were some responses, somehow it got lost. A glitch on the site, perhaps?