Many travelers (readers of the Traveler excepted) mistakenly believe commercial facilities in the national parks – lodging, dining, and retail - are operated by the federal government. While national park officials have ultimate oversight on things such as pricing, these facilities are operated by private companies that bid for the right to rent rooms, operate dining facilities, sell T-shirts, and offer specified activities such as trail rides and guided tours. NPS rangers continue to staff visitor centers and offer interpretive activities, but nearly all commercial activities are handled by the private sector.

Have you visited Hawai'i National Park and gotten close to the Kīlauea Volcano, enjoyed Paradise at Mount Rainier National Park, climbed to the top of Lassen Peak in its namesake park, or hiked down to Crater Lake? If so, you've placed yourself in the midst of some of the country's most dangerous volcanoes in terms of the threats they pose, according to the U.S. Geological Survey.

From Yellowstone to Grand Canyon, and Crater Lake to Sequoia, wildfires are burning in western areas of the National Park System. But the national park hardest hit by a wildfire is Yosemite, where the Yosemite Valley and Wawona areas were to close at noon Wednesday due to smoke and firefighters tied to a fire outside the park's western borders.

A volcanic crater within a volcanic crater is just one the unique aspects of Crater Lake National Park, a park that has a lake at its heart but which also tracks the fascinating geology of volcanism.