Here are some of them:some of the new 7 wonders and some of the old ones: www.eltourismo.com and I'm planning to add more wonders
My favorite one is Great wall of China as it is really a WONDER for me Hanging garden of babylon was also a good wonder PHYza
I've not visited any of these, so I wouldn't know. There are a few of these, however, that would be fun to visit.
for me... the best is still candi borobudur on indonesia and comodo island on indonesia too but taj mahal and greatwall china is good too.. want to go there..