What is the cost to go?

There's the fountain part with the names that is free. Then a museum of the tragedy which you gave today pay for, the top of the tower, which you have to pay for and a museum of the tower which you have to pay for also.

The memorial is free, going to the top of the tower I believe was $140.00 for a party of four (kids under certain age free)

Freeeee

There is a free part and the museum is about $20/person