FOR SALE: Largest ranch in the U.S. within a single fence; over half a million acres (798 square miles). Texas fixer-upper with more than 1,000 oil wells; 6,800 head of cattle; 500 quarter horses; 30,000 acres of cropland; tombstones for legendary cowboys, long-dead dogs, and a horse buried standing up. Favorite of Will Rogers and Teddy Roosevelt. Colorful history of drinking and divorce. Fifteen-minute drive to rib-eyes at the Rusty Spur in Vernon. Ideal for Saudi oil sheiks, billionaire hedge funders, and dot-commers who can tell a cow from a steer. Profitable. Zero debt. Property taxes only $800,000 a year. Price: $725 million.