2 Best Sights in Helena, Bozeman, and Southwest Montana, Montana

The Clark Chateau Museum, an elegant 1898 four-story Victorian mansion that was built by William Clark as a wedding gift for his son Charles, is open for self-guided and guided tours. Call ahead to reserve your spot. The house, a replica of one wing of the Chateau de Chenonceau in France's Loire Valley, displays 18th- and 19th-century furniture, textiles, and collectibles as well as artwork.

William Clark, one of Butte's richest copper barons, built the Copper King Mansion between 1884 and 1888. Tours of the house take in the hand-carved oak paneling, nine original fireplaces, antiques, a lavish ballroom, and frescoes. The house doubles as a B&B.