A famous St. Louis monument is celebrating a birthday today!

The final piece of the Gateway Arch was put into place on October 28, 1965 - 51 years ago today.

Help us celebrate the occasion by sharing a photo and a favorite memory of our beautiful city’s favorite monument on our Facebook page. Your photo and story might be shown on-air!

Viewer photos: 51 years of the Gateway Arch

Check out a color video of the final piece being installed below. Can't see the video? Click here to watch.