The incredible real estate portfolio of Microsoft billionaire Paul Allen

Microsoft cofounder Paul Allen lives a pretty fabulous life. With an estimated net worth of $18 billion, he's the 26th wealthiest man in the world, and he has the fancy yachts, planes, and lifestyle to prove it.

Allen also collects a ridiculous amount of properties across the globe.

From a hilltop mansion on the French Riviera to an entire island off the coast of Washington, Allen has made his fair share of blockbuster purchases over the years.