T. Boone Pickens, a famous oil prospector, hedge fund founder, and philanthropist, passed away on September 11 at age 91 .

Pickens had a long, successful career in business. He founded the oil and gas company Mesa Petroleum and the hedge fund BP Capital Management .

Read more : T. Boone Pickens, the 'Oracle of Oil,' Republican donor, and billionaire philanthropist, dies at 91

In 2017, he made headlines for listing his 100-square-mile ranch in the Texas Panhandle, northeast of Amarillo, for a whopping $250 million.

Keep reading for a look inside.

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