If you want to walk across the country, you need a few things: passion, persistence, and good shoes.

Luckily, 90-year-old Opal Lee has all three.

Lee set out on foot from her home in Fort Worth, Texas, on Aug. 31, 2016, with a mission to walk all the way to Washington D.C. And no, it's not just for exercise, a Guinness record, or some sort of Forest Gump-level brush with boredom.

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Aspen Institute