Crystal Bridges Museum of American Art, Bentonville, Arkansas
This shrine to American art has been in Bentonville since 2005. Big draws here include pieces by Georgia O'Keeffe and Andy Warhol, and a cavernous library filled with over 50,000 reference books about art and design. The building's unique design, with bold concrete blocks and a sloping copper roof, was the brainchild of leading Canadian architect Moshe Safdie. Crystal Bridges is open to free-timed ticket holders, which can be booked on the website.