Sacred Heart Basilica is the most impressive building in Timaru, and it tends to stop people who weren't expecting it. Built from Oamaru limestone — the same pale, warm-toned stone used for many of New Zealand's finest colonial buildings — it has a solidity and refinement unusual even for Catholic church architecture in New Zealand.
The interior is worth the effort of a visit. The painted ceiling is elaborate, the stained glass good, and the proportions of the nave give the building a proper sense of scale. It was built in stages between 1911 and 1940, and the craftsmanship throughout reflects the ambition of a community willing to invest seriously in its church. If the doors are unlocked, go in — it's open most days during daylight hours.