One World Observatory New Year's Eve Celebration. Ring in 2016 on Top of the World at One World Observatory's First-Ever New Year's Eve Celebration! This historic event on the 100th and 102nd floors of One World Trade Center is sure to draw a crowd, and you can now guarantee yourself a spot among the stylish revelers. Toast the beginning of 2016 where anything is possible. Where the backdrop is the most expansive and iconic skyline you’ve ever seen. Book and Save 20% Off One World Observatory New Year's Eve Celebration.