West Bengal is a beautiful place with beautiful people. I have been to Kolkatta once and was impressed with the varying colors of the city and beautiful people. Most ladies in Bengal have eyes that are really powerful and attractive. However I have not had much opportunity to visit many places in West Bengal but plan to do it some time. Here is Satba's opinion on the options in http://7wondersofindia.ndtv.com/vote.aspx?id=2.
To be honest, I do not think that there is anything that can be voted as a wonder. However among the list, the toy train and Victoria Memorial could qualify.
Sidenote: A better option would have been "Mamata" ! :) ... Just joking ....;-)