Craters of the Moon

"The pressure shifted, creating new steam vents and bubbling mud pools. The gentle 2.7km walk takes about 45 minutes and loops through a mass of steaming features. " Full review

"Boiling mud pools, steaming vents, and large craters appeared...a marked walkway snakes for 3 km (2 miles) through the belching, sulfurous landscape, past boiling pits and hissing crevices. " Full review