there are a FUCKTON in tokyo, theres apparently some along the great wall, shaolin temple, CERN, NHL team cities in canada (minus vancouver) quebec city, panama canal, santiago, buckingham palace, new york, think major internationally known locations (or things that SHOULD be internationally known minus what north americans seem to not know for one reason or another.)
my friend beat it last night, all 151, and yes, once you get 150 they toss in mew for you to find, but i wont spoil that location for you, but if you know pokemon, its pretty straightforward where youd find it