We've seen no shortage of futuristic, pie-in-the-sky projects backed by big money that seem like they'll never get off the ground.
The latest such project, one of the most audacious we've seen, flips the script: if it ever gets off the ground, it will never have to touch the ground again.
Confused? We sure are. This 'sky hotel' promises to provide lodging for 5,000 guests. Oh, and it flies continuously through the sky thanks to nuclear power.