Miniature building are everywhere...including The Smithsonian’s National Museum of the American Indian. The museum is unique to the National Mall in D.C. and stands out as very different from the other, more traditionally-designed architecture. Its undulating tan stone walls of Kasota limestone to evoke natural rock formations shaped by wind and water. Inside the museum’s permanent exhibit about Native American Ironworkers is a replica of the World Trade Center’s Twin Towers. Cut from recovered Ground Zero steel of the actual towers, the sculpture was created by Darryl Pronovost in 2001. This is a truly poignant and unique souvenir building.