Other than the UK.
France (Paris/Brittany/Ardeche/Perpignan)
Spain and most islands (Barcelona/resorts)
US (New York)
Czech (Prague)
Germany (Cologne/Frankfurt/Dortmund)
Portugal (Algarve only)
Egypt (Cairo and Luxor)
Netherlands (Amsterdam)
Poland (Krakow)
Mauritius
Singapore
Australia (Melbourne and Sydney)
Of the places I have been too I think my top 5 would be
New York
Prague
Barcelona
Krakow
Sydney
Hated Cairo.
Places I want to go.
Italy (Rome/Sorrento/Lakes/Venice)
Switzerland (Train tour through the alps)
Hungary (Budapest)
Austria (Vienna)
Croatia (Dubrovnik)
Serbia (Split)
Vietnam (Tour it North and South)
Cambodia (As part of above)
Thailand (Bangkok/Beach)
South Africa (Cape Town)
Canada (Rockies)
Morocco (Marrakech)
Portugal (Lisbon/Porto)
Spain (Madrid/Seville)
Germany (Berlin)
US (LA/San Francisco)
Many other must see places from you experienced travellers?
I have a lot of travelling to do when I retire.