In order,
1) Paris: Beauty, history, culture
2) Hong Kong: Size, scope, Victoria Harbour
3) Munich: Downtown, architecture and surrounding countryside
4) Salzburg: History, architecture, Mozart and Sound of Music ;)
5) Tokyo: Hustle and bustle, culture, food
Haven't been to Oz or NZ, so can't comment on them.
In Jolly Old, it has to be the Lake District and Cornwall. LOVE the British countryside!
No place like it in the world and miss it A LOT living in the Chicago's suburbs. Speaking of which, Honorable Mention to Chicago, as long as you go between June and September!! Not many cities have a sandy beach and clean, swimmable, SAFE water a few meters from world class downtown shopping and dining.