Kolkata Science City is situated near the J.B.S Haldane Avenue. It is one of the largest science centres in India. Entry fee is Rs. 50 and open from 9 am to 8 pm as I know. Lots of fun are there like 3D cinema, time machine, museum, scientific description of all event and science show. Really good and learning experiment for every visitor. Its a complete place for a perfect family trip.
We visited there and had a lot of fun. The Science and its astonishments are demonstrated here in an enjoyable way. Most probably the best learning and enjoying the place for a kid. Travel to this place is value for money.