At 1,377 feet above street level, the observation deck at the World Trade Center was the highest in the world when it opened in December 1975. https://t.co/gMeRgSioVs https://video.twimg.com/ext_tw_video/1837039823946653696/pu/vid/avc1/720x498/IgerLwEsCf3B6Xhi.mp4?tag=12