See the Amazing Spiderman at IMAX Airbus Theater at Udvar-Hazy Cen
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The Airbus IMAX theater is the coolest I've seen, with a six story tall screen, great seating, no sticky seats, and no endless trailers. It's a great place to see Spiderman in IMAX. Parking is free after 4 pm, and tickets can be bought in person or online at airandspace.si.edu/visit/theaters/uhc