Hill of Ward and Hill of Tara, Ireland
St. Patrick's Purgatory, Ireland
Actun Tunichil Muknal, Belize
Masaya Volcano, Nicaragua
Seven Gates of Guinee, Louisiana, U.S.A. - Seven Gates of Hell, Pennyslvania, U.S.A. - Gates of Hell, Turkmenistan - Hell's Gate, California, U.S.A. - Hell, Michigan, U.S.A. -Hell, Grand Cayman, Cayman Islands - The World's Rare Lakes of Fire
Phlegraean Fields, Italy - Naples, Italy
Pompeii and Herculaneum, Italy - Deadvlei (Dead Valley), Namibia
Dead Sea, Jordan and Israel - The Hells of Beppus, Japan - Blood Falls, Antarctica - Haw Par Villa, Singapore - Rotorua, New Zealand - Wai-o-Tapu Scenic Reserve, New Zealand
Waimangu Volcanic Valley, New Zealand - Yellowstone National Park, Wyoming, Montana, and Idaho, U.S.A.
Danakil Depression and Erta Ale, Ethiopia
Cave of the Crystals, Mexico
Gomantong Caves, Malaysia
Waitomo Glowworm Caves, New Zealand - Tsingy de Bemaraha, Madagascar - Deception Island, Antarctica
Craters of the Moon, Idaho, U.S.A.
Skull Rock, VIctoria, Australia
Hodge Close Quarry, England, U.K. - Boiling River, Peru - Lake Maracaibo, Venezuela
Kawah Ijen Volcano, Indonesia - Fengdu Ghost City, China - Kasanka National Park, Zambia - Bracken Cave, Texas, U.S.A. - Cape York, Queensland, Australia.
