The Smithsonian National Air and Space Museum Udvar Hazy Center in Chantilly Virginia has multi-level walkways from which you can view the various aircraft that are on the hanger floor or suspended at various levels from the ceiling. I was able to wrap my gorilla pod to the hand rail of these walkways to steady my camera. This allowed me to take my typical 10 shot HDR's and avoid the security guards who zealously enforce the "no tripods allowed" rule.