As the wealthy get wealthier, they're putting more of it into land.
America's 100 largest individual landowners added 700,000 acres to their landholdings last year, according to the Land Report 100, put out by the Land Report and Fay Ranches. Those 100 individuals or families now control more than 30 million acres, or 2 percent of America's entire land mass.
Ranches and farmland have become a popular investment for the wealthy, who are looking for more stable and tangible stores of wealth. Many of the largest landowners also generate income from their land, from sustainable timber and agriculture.
(Read more: What the rich really want in their homes)
"Significant properties are a finite commodity and have repeatedly shown over time to be resistant to our most challenging economic times," said Greg Fay of Fay Ranches, the ranch brokerage firm.