Open Pavements is listed as a historic site at 3 Wellesley St W, filed under Mangatangi in the Franklin district. It has a 5.0 rating on Google. Wellesley Street West is better known as an address in Auckland's city centre, so the location may be mixed up and is worth checking.
A good historic site helps you understand a place through what remains on the ground, often with signs or plaques to give context. Sites like this are usually quick to visit, so they suit a short stop or a walk through a neighbourhood rather than a full outing. Before you go, confirm the exact address, look up the history of the site and check whether the public can enter. Regulars know that reading plaques carefully is where the detail is, that mornings and weekdays are quieter and that comfortable shoes help when a visit involves walking streets. Stay on public paths, leave any heritage features undisturbed and take your rubbish home.
For anyone interested in local history, Open Pavements is a listing to check before you head out.