When we think of how the ultra-wealthy live, we tend to imagine private jets and luxury cars and sprawling, gorgeous estates with impractically large mansions. It seems pretty sweet if you can afford it, but it hasn't always been that way. After all, mansions have only existed for so long. Before them, the upper crust was living it up in sweet castles. And some people still are. Those things were built to last, so if you're in the market and have the funding to manage it, you can still find some for sale around the world today. They may be a little draftier than your average house, and likely the plumbing and wiring has needed some updates, but is anything cooler than a massive, gorgeous castle? 

If you were among the wealthiest folks in the land, what do you think you'd be doing with all of your cash? Would you set up shop on a private island? Invest in space exploration? Buy the most exclusive supercars you could find, or travel to every country to sample the best, authentic cuisine from the four corners of the world? Whatever you'd do, tell us all about it, and we'll pick the perfect castle for you to call home.