The building used to be the Wonders of Life pavilion. As of January 4, 2004 it began to operate seasonally, closing permanently on January 1, 2007. They use it now for the Food Wine Festival (I was there this past October they had some exibits going on it there) sometimes it s used during the Flower Garden Show.
Horizons has been replaced with the Mission: Space building. The building you are seeing used to be the Wonders of Life pavilion. It had been seasonal a long time before it finally shut down a couple of years ago. They have used it for special events a couple of times, but right now it is just pretty much unused.
It used to be Wonders of Life you can google it and see what was in it before. They only use it for special events now. Horizons is now Mission Space.
I think it was this thing called Wonders of Life, which was a expo about the human body that was open seasonally which means occasionally, but mostly never. They might be redoing it now.hope this helped:)