This extraordinary cave in Mexico glitters with crystals. The Cave of Crystals, also known as Cueva de los Cristales, was discovered by drilling nearly 1000ft below ground in the Naica mine.
The Lastarria Volcano, which is located in South America's Atacama Desert, develops yellow, sulphur fumaroles. It appears like a place belonging to an inhospitable alien planet.
The Wave is a stunning and rare rock formation in the Paria Canyon-Vermilion Cliffs Wilderness' Coyote Buttes area in northern Arizona. It famously changes its vibrant colours throughout the day and the year.
The Door to Hell is a huge and fiery crater located in the Karakum Desert of Turkmenistan. This is a natural gas field which has continued to burn continuously since it was set on fire accidentally in 1971.
This rare pink lake looks like a perfect host for some space explorers. Lake Natron in Tanzania has this colour due to its composition of salt and soda.
Danakil Depression is a place which bursts with hydrothermal activity as water literally boils from the ground.
The Namibian desert's salt pans appear to be situated on another planet. One can see these pans in the Etosha National Park.