Hawaii Volcanoes National Park is on Hawaii Island (the Big Island). At its heart are the Kīlauea and Mauna Loa active volcanoes. The Crater Rim Drive passes steam vents and the Jaggar Museum, which features volcanology exhibits and a viewpoint overlooking Halema'uma'u Crater. Thick ferns mark the entrance to the Thurston Lava Tube (Nāhuku). The Chain of Craters Road weaves over lava. Trails crisscross the park.