Climate change impacts and over allocation of available water have landed the Colorado River, which flows through some of the country's most iconic national parks, at the top of American River's annual list of endangered rivers.

Across the National Park System, there are many overlooked gems that merit your attention. That's a fact, despite another fact: Of the 297 million visits to the park system in 2021, half were recorded in just 25 units of the park system. In National Parks Traveler's very first webinar, Editor Kurt Repanshek is joined by Contributing writer Kim O'Connell and RVer Rene Agredano to point out some overlooked sites that deserve your consideration when it comes to planning a trip into the system.

Climate projections under current warming trends across the globe point to significant changes across the National Park System, according to an analysis prepared by the researchers at Climate Central.

With 423 units in the National Park System, there will always be plenty to learn. So, take this National Parks Traveler quiz and test your knowledge and see how much you know before checking the answers at the bottom of the page.