santiago calatrava, architecture, design, building, modern, futuristic, avant-garde, new york, new york city, one world trade center, stole, glass, high, tower, template, background texture, imposing, roof, abstract, sightseeing, landmark, tourist attraction, america, usa, skyscraper, financial district, metropolis, manhattan, united states, big apple, american, united states of america, david childs, daniel libeskind, libeskind