Here's an unusual look at the underside of the Monsanto House of the Future (from 1963). There's something about the waterfalls and pools under the house that is vaguely reminiscent of Frank Lloyd Wright's "Fallingwater" in Pennsylvania. Or am I just nuts? ;-)
Of course the house was removed in 1967, and the King Triton fountain (what's he doing in Tomorrowland?) was placed in the remaining pools.