Earth Day also falls during National Park Week. Celebrated for 55 years, one billion people in 193 countries host events and celebrations of the planet, its resources and our commitment to protect it. Many of our national parks will have special Earth Day demonstrations of earth science or discussions of the latest environmental concerns.

Celebrate National Park Week with free admission on April 19 and explore the beauty, history, and music-inspired theme of more than 400 national park sites across the U.S.