Man, grandmother visit 49th national park in lower 48 states

Brad, 38, and Joy Ryan, 89, have been traveling since 2015, attempting to travel to all 61 U.S. national parks.
2:27 | 11/09/19

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Transcript for Man, grandmother visit 49th national park in lower 48 states
Finally tonight here, our persons of the week. We all love grandma joy, her love for her grandson, and her spontaneity. You first met Brad Ryan and his grandma joy right here. They told us they had a goal, to visit all our national parks. Embarking on their first road trip to a national park in 2015. There she is at great smoky mountains national park in Tennessee where grandma joy spent her first night in a tent, at 85. She had never camped a night in her life. We arrived at 1:00 A.M. In the rain, and she held the umbrella over my head while I put the tent together. The majority of her life has been spent in this tiny little town in Ohio called Duncan falls. Reporter: Tonight, the two have now traveled 40,000 miles across 41 states. Great sand dunes national park in Colorado. We walked across the sandy landscape and up a sand dune and then she got down on the ground. And I said, what are you doing? And she said, I want to roll down. That looks fun. I think it just tapped into some sense of childhood wonder in her. You lived! Have fun getting back up. Reporter: He brought grandma joy to the grand canyon, yellowstone, Joshua tree, glacier national park, and redwood national park. How do you feel when you look up at these trees? They make you feel very small. Does it make you feel very young? Not me. I've walked too many miles. Reporter: Since we first met them, the pair has traveled to 20 more parks. Checking in with us from Texas. Hi, David. This is grandma joy and Brad coming to you from big bend national park in Texas. Right now we're at the Rio grande river at the Santa Elena canyon, and it is so beautiful here. Reporter: And at 89, she says she's ready for anything. Even a bear. What is your plan? I'm going to hit him with my cane. Reporter: And tonight, their road trip wrapping up with one last park just today. Gateway arch national park in St. Louis. We've made it to our 49th and final park in the lower 48. How do you feel to finally be done? Well, it's kind of sad to know it's coming to an end, but it's kind of great to know we finally made it. Reporter: And what's next for grandma joy? I am ready to go home, kick back my heels, and sit down and rest a minute. I think that's well earned. Good job, grandma joy. And so (Sam) Hey, have you heard about blacktitanium? (Sarah) Yeah, that heavy metal band thats like, so metal all their

This transcript has been automatically generated and may not be 100% accurate.

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