To mark National Park Week, Outdoorsy unveiled 40-plus national park guides and 1,000-plus state park guides for RV travelers and adventurer seekers to reference when planning their next road trip.

Outdoorsy reported in a press release, the National Park System welcomed nearly 331 million visitors in 2017. Six million visitors flocked to see the mesmerizing Grand Canyon, the hoodoos of Bryce Canyon attracted 2.5 million tourists and 4 million people saw the towering red cliffs of Zion National Park. In fact, half of national park visitation occurred in 27 of the 60 national parks.

To help people navigate their travels, Outdoorsy has provided five listings for “under the radar” national parks in its listing of national and state parks. They include:

North Cascades National Park, Washington

With more than 300 glaciers, endless rugged peaks and just 30,000 annual visitors, North Cascades National Park offers RVers evergreen-tree-lined hiking trails and turquoise lakes. According to Outdoorsy, there are no park entrance or backcountry permit fees.

Katmai National Park and Preserve, Alaska

Located in southern Alaska, Katmai National Park and Preserve covers more than four million acres and hosts around 30,000 visitors each year. The park and preserve offer varying landscapes — including lowlands, coastlines and glaciated mountains — along with dozens of wildlife species.

Pinnacles National Park, California

Formed by volcanoes 23 million years ago, Pinnacles National Park is located in central California near the Salinas Valley. The park covers more than 26,000 acres and hosted 230,000 visitors in 2017. By comparison, its neighbor Yosemite National Park welcomed more than four million visitors.

Great Basin National Park, Nevada
Nevada’s largest national park, located in eastern Nevada near the Utah border, covers more than 77,000 acres. Established in 1986, Great Basin National Park welcomed just 168,000 visitors in 2017. The park is full of natural wonders including alpine lakes, limestone caverns and freshwater streams.

Dry Tortugas National Park, Florida
This 100-square-mile national park preserves seven islands as well as a former military facility, Fort Jefferson. With colorful coral reefs and a plethora of sea life, the park is mostly open water for snorkeling or diving. Just 54,000 people visited the park in 2017, perhaps because it’s only accessible via plane or boat.

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