LEGO Architecture: Gateway Arch
St. Louis, Missouri's Gateway Arch is another popular American architectural wonder. At 630 ft. from top to bottom, and 630 ft. from base to base this catenary curve impresses millions of visitors anually. The model, though, stands a mere 3'0" tall and contains 3,200 pieces. It look 60 hours to design and 40 hours to build.
Photo of LEGO Architecture exhibit by Wally Bahny for TechRepublic
I believe the open areas are actually parking. Odd, but there's parking spaces with cars in them all around the outside of the building. Not sure how they get up there, I always assumed some sort of elevator.