The Door to Hell is a natural gas field in Derweze, Turkmenistan and is known for its natural gas fire which has been burning continuously since it was lit by Soviet petrochemical scientists in 1971.
Massive beams of selenite dwarf explorers in the Cave of Crystals in Naica, Chihuahua, Mexico. Some single gypsum crystals in this cave are 36 feet long and weigh 121,200 pounds, some of the largest natural crystals ever found.
A general view of the Tianzi Mountain at Zhangjiajie national park in Zhangjiajie, China. Zhangjiajie is home to striking sandstone and quartz cliffs and its mountain formations are famously known for as the inspiration for the fictional world ‘Pandora’ in the film, ‘Avatar’.
At Red Beach in Panjin (about 300 miles northeast of Beijing), China, a unique variety of alkali-tolerant seaweed will turn from green to a vibrant crimson red in the fall, to the delight of tourists who flock to the wetland.
The Moreaki boulders are huge spherical boulders scattered along Koekohe Beach in New Zealand. According to Maori legend, the boulders are eel baskets washed up from an enormous, sunken canoe. Scientists explain the boulders as calcite concretions formed about 65 million years ago.
Gateway to the underworld? Located in Florence, Oregon near Cape Perpetua, Thor’s Well is a gaping sinkhole in Cook’s Chasm with waves that can reach a height of 20 feet. While beautiful, the natural wonder can be dangerous. Sharp rocks are everywhere and a strong surge of water could suck you down into the abyss.
Near the city of Morondava in western Madagascar lies a surreal forest of majestic baobab trees, jewels of the island country’s landscape. Tourists flock to this famed road, a protected zone, where the baobab, often called the ‘upside down tree,’ reaches a height of up to 80 feet tall and are up to 800 years old.
Located on the uninhabited island of Staffa, Fingal’s Cave has a unique, cathedral-like structure and hexagonal columns, according to the National Trust for Scotland. The cave was immortalized by Mendelssohn in his Hebrides Overture, after he visited the island in 1829.
Located northwest of Osoyoos in British Columbia in Canada, Spotted Lake contains extremely high concentrations of minerals. Most of the water in the lake evaporates over the summer, leaving behind all the minerals in ‘spots.’
The Marble Caves (Cuevas de Mármol) are located on a peninsula of solid marble bordering Lake General Carrera, a remote glacial lake that spans the Chile-Argentina border, according to Atlas Obscura. The patterns that give the marbleized effect were caused by 6000 years of wave erosion.
The Devils Postpile formation, located in extreme northeastern Madera County in eastern California, is a rare sight in the geologic world and ranks as one of the world’s finest examples of columnar basalt. Its columns tower 60 feet high and display an unusual symmetry.
Yueyaquan is a crescent-shaped lake in an oasis, south of the city of Dunhuang in Gansu Province, China. The depth of the lake, a popular tourist spot, had decreased over the years as sand encroached on the site but in 2006, the government started to fill the lake and restore its depth.
The Chocolate Hills are an unusual geological formation in Tagbilaran, Bohol, Philippines. According to a survey, there are 1,776 hills spread over an area of more than 20 sq. mi. covered by green grass that turns brown (resembling chocolates) during the dry season.