Known as the "Westminster Abbey of the Pacific," Kawaiahao Church was the first Christian Church built on Oahu. Dedicated on July 21, 1842, “The Great Stone Church” is made of 14,000 coral slabs from ocean reefs that were hauled from the sea by native laborers and missionaries. The church and the grounds were named a National Historic Landmark in 1962.
https://www.gohawaii.com/islands/oahu/regions/honolulu/kawaiahao-church