Going-to-the-Sun Road, a scenic two-hour drive within that park, is also a great way to spot wildlife like mountain goats and bighorn sheep, Insider previously reported.
A red car drives along Going-to-the-Sun Road in Glacier National Park.
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Also in Arizona, Marc and Julie said to check out Sedona, a beautiful town embedded in red rocks that Insider previously reported feels like visiting another planet.
Marc and Julie in Sedona, Arizona.
Courtesy of Marc and Julie Bennett
Halfway between Phoenix and Palm Springs, Julie and Marc recommend staying in Quartzsite, Arizona, a tiny town that was featured in the film "Nomadland."
The Bennetts boondock in Quartzsite, Arizona.
Courtesy of Marc and Julie Bennett
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In their book, Marc and Julie Bennett wrote that you can't miss Yosemite National Park in California, which recently stopped requiring reservations to enter, Travel and Leisure reports. The reservation system began in May and ended on October 1.
Yosemite National Park in California.
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Since Zion is often crowded, Marc said to try Capitol Reef instead, describing the Utah national park as a "fantastic surprise" to him.
A scenic drive through Capitol Reef National Park in Utah.
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If you're traveling through New Mexico, Marc and Julie said not to miss Carlsbad Caverns.
Carlsbad Caverns National Park in New Mexico.
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Insider reported that it's cool and humid inside the caves. Although they're mostly dark, there are lights that reveal different shapes, colors, and textures.
Dramatic scenes within the caves.
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Up in Colorado, Marc and Julie said Rocky Mountain National Park is a must-see.
Rocky Mountain National Park in Colorado.
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In South Dakota, you have to drive through Badlands National Park, Marc and Julie said.
Marc and Julie drive through Badlands National Park in South Dakota.
Courtesy of Marc and Julie Bennett
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While you're there, the couple suggests exploring Black Hills National Forest.
Black Hills of South Dakota.
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Marc and Julie also highlighted entire states that stood out to them in their travels, like Maine in the summertime.
Mark and Julie in front of Nubble Lighthouse Tork in Maine.
Courtesy of Marc and Julie Bennett
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"The further north you get, the more you're getting away from the crowds. It's beautiful," Julie said.
Marc takes a photo of a lighthouse in Maine.
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Pennsylvania is a friendly and scenic state to drive through in an RV, according to the Bennetts, who said they particularly enjoy Amish Country.
The Bennetts visit Amish Country in Pennsylvania.
Courtesy of Julie and Marc Bennett
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In terms of standout cities, San Francisco, California is a must-see, according to the Bennetts. Drive across the Golden Gate Bridge and visit Napa Valley, too.
A view of San Francisco, California, from Twin Peaks.
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Julie added Savannah, Georgia, stands out too, with its "real Southern charm, history, and natural beauty."
Savannah, Georgia.
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Don't miss the monuments and museums in Washington, DC, the couple said.
A far-off view of the Lincoln Memorial in Washington, DC.
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In Louisiana, Marc and Julie wrote in their book to visit the Whitney Plantation Museum outside of New Orleans.
Tourists visit the Whitney Plantation in Edgard, Louisiana, in 2017.
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In Virginia, Marc and Julie recommend boondocking, or staying off-grid, at a winery.
Marc and Julie at a winery in Virginia.
Courtesy of Marc and Julie Bennett
For more ideas, the best way to find hidden gems is to ask locals for their favorite places to go, Marc and Julie wrote in their other book, "RV Hacks."
Marc and Julie at Zion National Park with their first RV.
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