With winter slowly but surely losing its grip on Lassen Volcanic National Park, spring and summertime activities are ramping up at the park. The Lassen National Park Highway, for instance, is scheduled to open to through traffic on Saturday, June 22, at 4:30 p.m.

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.

Since 1966, national scenic and historic trails have been an American priority. They traverse mountains, canyons, forests, and grasslands across the country, crossing creeks and rivers and skirting lakes. These narrow corridors through the wilderness provide recreation and protect historic resources while conserving natural features. There are many physical, emotional, and logistical requirements for these trips, and winter is the perfect season to get in shape and plan for a long walk. Here’s a quick look at a few of these trails to help you plan a trip.