The Iolani Palace? is one of the most impressive structures in Honolulu and holds much of the state's history in its walls.?  The Palace was the official residence of King Kalakaua and Queen Liliuokalani, the last king and queen to rule Hawaii.?  It was originally built in1883 for a sum of $360,000 and was the royal residence until the monarchy was abolished in 1893.?  The best way to see the main rooms and upper floor of the Palace is to go on a docent guided tour (which costs about $20 for adults, $5 for children over 5).?  It is a good idea to make reservations ahead of time because the tours can get booked up quickly.?  The knowledgeable docents provide a great history and context that adds a certain sadness to the beautiful setting.?  You can also do a self-guided audio tour for cheaper ($12 per person).?  Gallery tours of the basement, which features the compound's kitchen, the Chamberlain's office, and a number of displays of royal regalia and jewelry, are self-guided and cost $6 for admission.