Smithsonian Udvar Hazy Center Modern Observation Tower Chantilly United States // CHANTILLY, Virginia — A glass-enclosed observation tower rises beside the exposed steel truss canopy at the entrance of the Smithsonian's Steven F. Udvar-Hazy Center. Designed by architectural firm Hellmuth, Obata + Kassabaum (HOK) and opened in 2003, the facility utilizes high-tech structural elements like the prominent tubular steel space frame to visually echo the aerospace engineering of the museum's artifacts. The 164-foot Donald D. Engen Observation Tower is modeled directly after modern air traffic control

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