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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? wn. l 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: si...

Have fun getting back up. >> reporter: she did and the kept going. visiting the grand canyon, teton national park, yellotone, joshua tree and glacier national park and redwood national park. >> hey, grandma, where are we? >> we're in the middle of a redwood forest. >> 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: and she's still walking. texas and new mexico next. tonight, we're cheering for grandma joy. 32 parks to go. she turns 90 next year. i'm david muir. we'll see ...

Jonathan vigliotti is there. >> reporter: america's coldest frontier isn't built for tropical-like heat, but both humans and wildlife found unusual ways to cool off. in alaska's dense forests, the heat is exposing a lurking danger. >> so this spruce tree was attacked by spruce beetles this year. >> reporter: entomologist jessie moan says in 2018, the spruce beetle has devoured more than 900,000 acres of forest. what do you think is causing this spike? >> earlier springs followed by later falls allows those larvae to develop more in one season than they would have under some of our normal summe...

Minutes touting the economy at the outset there and talked about the progress on the opioid epidemic, the event that he and the first lady are headed for in atlanta, georgia. before leaving a number of questions about the mcgahn subpoenas that now the president says he will fight. he says i'll fight all the subpoenas. the democrats are trying to win in 2020. the only way they can luck out is by constantly going after me. that's the position of the white house. there will be a legal fight over this. how long it lasts we do not know. who wins ultimately we don't have an answer on that, either. h...

Nowhere, and mysteries that go unsolved. cold case detective mark wilson had been trying to unravel one of those mysteries, the disappearance of albuquerque native mike snyder. >> he could have had a successful job anywhere in the country. >> one that would have shown up on your sglerch right, yes. >> but there was no trace of him. not anywhere. it was as if the master mechanic had simply vanished. >> there wasn't any indication of anything that would match up to him. >> but mike snyder had filed income tax returns in 2004 and 2005, years after he disappeared. it was quite simply very, very od...