Dave Kroese

Dave Kroese at Bryce Canyon National Park in Utah.

U.S. national parks are some of the most remarkable places in the country.

From Grand Canyon National Park here in Arizona to Yellowstone or Yosemite, there are a lot of them we all know and love, but there are also hundreds that are lesser known — but no less interesting.

After a 25-year career in the biotechnology sector, David Kroese changed paths and became one of a very small number of people who have visited all 418 National Park Service units in the country. And he wrote a book about it.

It’s called "The Centennial: A Journey Through America's National Park System," and he spoke with The Show about his journey.

EDITOR'S NOTE: Identifying information in a gallery photo has been corrected.

More Stories From KJZZ

• National Parks To Allow Electric Bikes On Trails Where Bikes Are Permitted
• Grand Canyon Officially Recognized As International Dark Sky Park