Always dreamed of living the luxe lifestyle but thought you needed gazillions of bucks? Check out these mansions for under a million bucks. What constitutes a mansion, anyway? Is it square footage? Price? Luxury facilities? All three put together in some sort of swanky combo? For our purposes, size matters. We found five luxury homes, all measuring more than 7,000 square feet. And prices matter, too—budget prices. Can you believe...