Have you only been using the services of bank and never thought about how it works? You can find it out now in this museum. History of BNZ!
Official website http://www.bnz.co.nz/about-us/history/bnz-museum
Phone +64 04 474 6933
Address 60 Waterloo Quay, Pipitea, Wellington 6011, New Zealand
Coordinates -41°16'45.372" N 174°46'54.692" E