Alice Walton, the 75-year-old Walmart heiress & the world's richest woman with nearly $100 billion wealth, spends her fortune on expensive art, horse breeding, among other things. Her collection includes original works from Andy Warhol and Georgia O'Keeffe. She opened her private museum and also owns several properties. In 2016, she donated shares worth $225 million to her family's non-profit.