As part of a series on Dean Kamen, the TechTV show TechLive ran
a story about Dean Kamen's house, which is packed full of all kinds of cool playthings - a baseball field, two helicopters, machine shop...
The link above is to a text version of the story. If you've got the connection, though, I'd recommend watching the video. It's definitely worth it. At the bottom of the page, there are links to the other installments of the series...including one on FIRST. If you've got the time, the series is an interesting read.