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Hawai'i's largest is the Iolani Palace, the former kingdom’s royal residence, estimated at 60,000–70,000 sq ft across multiple floors. Completed in 1882, it boasts a throne room, grand suites, and a rich history. Today, it is a museum and the only remaining royal palace on U.S. soil.
Idaho: Silverton Estate — A Mountain Retreat
Idaho’s biggest home is a 35,000 sq ft estate in Silverton, built in 1910, featuring 36 bedrooms and 25 baths. Once a private residence, hotel, and now a museum, it illustrates the grandeur of early 20th-century mountain mansions surrounded by natural beauty.