America’s national parks include some of the most cherished natural landscapes and cultural sites in the world. Today is World Heritage Day and we’re recognizing a unique park with a global profile. Hawai’i Volcanoes National Park is one of the few places on Earth where visitors can safely get an upclose look at an active volcano. Witness powerful natural forces at work as Kīlauea and Mauna Loa (two of the world’s most active volcanoes) continue to add land to the island of Hawaiʻi. Photo by Janice Wei, National Park Service.