The National Park Service celebrated its 100th anniversary with a party in Brooklyn Bridge Park Monday night.
The celebration included food, music and an appearance by Bill Nye "The Science Guy."
One of the highlights was a puzzle on a giant digital circuit board that allowed participants to control the color of the spire atop One World Trade Center.
Organizers say lighting the tower illustrates the innovation that the Park Service celebrates.
"The spire is changing color based on the activity the visitors are doing tonight which is learning about conductivity and conducting electricity," said April Slayton with the National Parks Service. So it's changing each time they complete the game and it's making the skyline a little brighter tonight."
"I've grown up going to Colorado and being in national parks my whole life, so it's fun to be here and be a part of it and just see what they've done over the years and what they are doing now and what they'll do in the future," said one woman who attended the festivities.
This event was the third in a summer-long celebration.
The National Park Service will turn 100 years old on Thursday.