Tongariro National Park - volcanoes Mount Tongariro on the left and perfectly cone-shaped Mount Ngauruhoe with blooming heather in autumn . Tongariro National Park, Tongariro World Heritage Area, North Island, New Zealand. Tongariro National Park is a World Heritage Area and was used for the filming of many scenes for the 'Lord of the Rings' Triology. Mt Ngauruhoe is Mt Doom in the films but was digitally altered considerably. The Heather was introduced by Europeans and is threatening to surpress native flora beacuse it spreads so fast.