I knew this happened yesterday as well, but the 26th birthday of Horizons was yesterday.
Horizons was one of my most favorite attractions at EPCOT (yeah, I still capitalize it). Growing up and going to Disney, it was always a special part of our trip to the park.
One of the greatest tribute sites I've seen, Horizons 1, made mention of the 26th birthday. On their site they have links to Martin Smith's tribute videos and some music, all of which I highly recommend.
