St Mary's Cathedral is the seat of the Archdiocese of Port Moresby, located in the older downtown precinct near the waterfront. The building is a solid mid-century structure that looks onto a small plaza. It is open to visitors outside of service times and is a calm retreat from the noise of the city.
The interior holds some fine local carving and woodwork incorporated into the liturgical furnishings — small pieces that reflect the Catholic missions' integration of Melanesian craft traditions. Worth a short stop if you are exploring the downtown area on foot.