(image via National Geographic Channel)
Leave it to NatGeo. They used 300 helium balloons and recreated the house in Disney's Up. It worked and soared for an hour!
I found the one flaw in their design: they didn't account for the weight of a pudgy Wilderness Explorer, a talking dog and a cranky old man. Next time.
(You've seen Up, right? If not, you must. It is so sweet.)