Downtown Honolulu ʻIolani Palace, was the residence of King Kalākaua and his sister and successor, Queen Liliʻuokalani. It is the only royal residence in the US. Ali’iolani Hale, the Hawai’i State Supreme Court. This is shown on the TV series Hawai’i Five-0 as Five-0 task force headquarters. Statue of King Kamehmeha I. A duplicate of this statue is also in Statuary Hall in the US Capitol. Kawaiahao Church was the first Christian church in Hawaii, built between 1836 and 1842. It features a New England style architecture, and for its construction, about 14,000 slabs of coral rock were digged out by hand from offshore reefs on Oahu’s south shore. Divers had to dive 10 to 20 feet under water and with hand tools chisel out each coral block, which were then transported from the reef to the shore.