This Strato Cruiser Airship is a gigantic, helium-filled blimp that's got a gourmet restaurant, a spa, a swimming pool, a resident DJ, library, and private mini-offices. Yeah, it's pretty much designed for a super-villain, but I'm sure just kinda-evil rich people would enjoy it quite a bit as well. And while the design is loaded up with high-falutin' tech like carbon fiber skin, sectional helium chamber design and photovoltaic cells, it's still just a concept, and will probably stay like that for some time.
(Via The Keyhoe Report.)
Airships not your bag? How about a flying car?