Some distance away, in Tomorrowland near Space Mountain, another building sits, with a waterfall at one end and a canopied balcony above. Below it only houses bathrooms. Remnants of a space port perhaps? Some futuristic shuttle docking port for the Endor Express?
Both were the endpoints of the Magic Kingdom Skyway ride - a somewhat typical gondola ride travelling
between Fantasyland and Tomorrowland. Each gondola could hold a few people and gave a spectacular view of
the Magic Kingdom. The Skyway would roughly follow the pathway through Fantasyland all the way to the Indy
Speedway, and would turn at a tower in the middle of the speedway down to the Tommorrowland terminal.
Disneyland had a very similar ride, which actually passed through the Matterhorn. Both rides closed - Disneyland's in 1994, and the Magic Kingdom's in 1999 (it was open in April of that year, but closed sometime later). These two buildings were all that remained, and for almost 10 years sat unused and unchanged.
That changed at the end of 2009, when the Tomorrowland Skyway station was partially demolished to improve sitelines. The bathroom section was retained, however. No word on what future plans there may be.