All major roads leading to and within Yellowstone National Park are opening for the Memorial Day holiday weekend—and for the summer season. There will some construction delays beginning in late May.

Mules in Grand Canyon National Park. They can be a bane, and they can be a beast of burden that makes your trek down into the abyss somewhat easier. Now park officials want to know if mules should continue to be utilized in the Grand Canyon.

Lake Mohave is one of two large reservoirs at Lake Mead National Recreation Area. Memorial Day weekend is traditionally one of the busiest times of the year for the park, but this year's holiday has an unwelcome wrinkle for visitors to Lake Mohave: dead carp.

A spate of fatalities in the national parks this spring sends a sobering message: parks can be dangerous places. But they don't have to be if you remember some simple rules when visiting the parks.