I should be working, but who can resist a list?....
EUROPE
UK, Ireland, Portugal, Spain, France, Belgium, Holland, Luxembourg, Germany, Denmark, Poland, Slovakia, Czech Republic, Hungary, Austria, Switzerlnd, Russia, Italy, Greece, Armenia
AFRICA
Malawi, Morocco, Algeria, Mali, Burkina Faso, Cote d'Ivoire, Ghana, Togo, Benin, Nigeria, Cameroon, Central African Republic, Zaire, Rwanda, Tanzania, Kenya
USA
China / Hong Kong
Some of the African countries are a bit of a cheat - Togo and Benin in particular are pretty small.
Favourite places? Tanzania, where I used to live, is a wonderful place in pretty much every way; Zaire and Algeria I was fortunate enough to visit in the late 80s, before terrible conflict hit, and each was magnificent; I abhor the anti Americanism which many in the European liberal left feel is acceptable, and I think the country and its people are as wonderful as a country and a diverse group of people can be. But, possibly rather boringly, I think if I had to choose a favourite, Germany would probably just - but only just - nudge out France in the final.