Some castles are just for show, and we're not saying that this isn't one them, but it also looks like it could genuinely hold off an invading army if need be. It looks solid. Also, huge. The castle itself, built in 1848, has 11 beds and 10 baths, and totals a whopping 15,650 square feet. In addition, it comes with a little kingdom to rule over with four guest homes, a library, pool house, conference center with community kitchen and dining facilities, indoor racquetball court, tennis court, and pool. It's on the market for $5.49 million.