Do you have the list of countries that U2 toured? I'm curious
Sure. It's actually from a draft of an article for U2gigs. I may finish it some day when I get the time - work and life are thoroughly getting in my way at present.
These are U2's stats to October 2014 (i.e. the forthcoming tour is NOT counted, and I am only counting full tour concerts, so no promo gigs, TV appearances, Bono-singing-at-a-pub, etc.):
Africa (1 country; 4 shows): South Africa (4).
Asia (3 countries; 21 gigs): Israel (1), Japan (19), Turkey (1).
Europe (22 countries; 661 gigs): Austria (6), Belgium (24), Bosnia and Herzegovina (1), Croatia (2), Czech Republic (1), Denmark (9), Finland (4), France (35), Germany (49; all pre-reunification shows were in West Germany), Greece (2), Hungary (1), Ireland (176), Italy (26), Netherlands (41), Norway (6), Poland (3), Portugal (6), Russia (1), Spain (16), Sweden (16), Switzerland (13), United Kingdom (227: England, 188; Northern Ireland, 9; Scotland, 24; Wales, 6).
North America (3 countries; 640 shows): Canada (57), Mexico (12), USA (571).
South America (3 countries; 19 shows): Argentina (8), Brazil (8), Chile (3).
Oceania (2 countries; 77 shows): Australia (63), New Zealand (14).
Total: 34 countries, 1,422 shows.
By way of comparison, here is a sample - a small sample - of other major touring acts, again as of October 2014:
Elton John: 76 countries
Metallica: 61 (plus Antarctica)
Iron Maiden: 55
Guns n’ Roses: 54
Lady Gaga: 53
Red Hot Chili Peppers: 53
Bob Dylan: 52
Bon Jovi: 49
Muse: 48
Rolling Stones: 47
Green Day: 41
The Cure: 38
David Bowie: 37
Pearl Jam: 37
Bruce Springsteen: 34 (three quarters of all gigs he has ever played are in the US)
Coldplay: 34
Foo Fighters: 34
Rush: 19
Garth Brooks: 10