Ca' d'Zan, 5401 Bay Shore Road, Sarasota, Fla.; +1 941 359 5700; admission $25
Royal Relic: 'Iolani Palace (Honolulu)
Story: The only former official residence of a reigning monarch on U.S. soil, 'Iolani Palace was Hawaii's grandest symbol when it was completed in 1882.
Occupied by Hawaii's last two monarchs before American annexation, the palace would subsequently be used as a Red Cross dressing station and the state's first capitol building.
Today, the National Historic Landmark is a museum open to the public.
Specs: Filled with imported furnishings, royal gifts and art from around the world, the 34,104-square-foot royal abode featured late-19th-century technological luxuries like electric lighting (installed in 1887, four years before the White House) and telephones.
Highlights include the Grand Hall, lined with portraits of Hawaiian monarchs, the crimson-gold Throne Rome where King Kalakaua hosted grand balls and state dinners, and the Blue Room, which features a giant portrait of King Louis Philippe of France received in 1848.
Stopping by: Docent-led and guided audio tours let guests explore 'Iolani Palace's first and second floors.
Guests can peruse Hawaiian regalia exhibits in the basement gallery and explore the spacious grounds, which include the old royal barracks and Coronation Pavilion where Kalakaua was crowned king in 1883.
'Iolani Palace, 364 S. King St., Honolulu; +1 808 522 0822; guided tours $21.75, self-led tours $14.75