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Veterinarian Brad Ryan and Joy Ryan, both from Zanesville, Ohio, have so far visited 29 national parks since they set off on their quest in 2015 and Grandma Joy, who had previously never glimpsed the sea or even a mountain, has now 'seen more of America than a majority of Americans ever will'. Brad, 38, says he and Grandma Joy became estranged after his parents' divorce a decade ago and it was only after they started to reconnect that he learned how much she regretted never seeing the world - and an idea was born. Pictured: Brad and Grandma Joy in Yosemite National Park (top left); Grandma Joy in Badlands National Park in South Dakota (main); the octogenarian in Dry Tortugas National Park in Florida (bottom right); in Yellowstone National Park (top right) and Brad and Grandma Joy in Arches National Park in Utah (bottom left).