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Ruskeala (Russia) - Ruskeala is a rural town located in the Republic of Karelia, within the Russian Federation, and is also the site of a famous marble quarry.

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Ruskeala (Russia) - Much of one of the quarries exploded about 250 years ago and the site flooded, forming what we see today. Since then, this wonder can be visited by tourists from around the world.

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Darvaza gas crater (Turkmenistan) - Known locally as the 'Door to Hell' or 'Gate of Hell,' this incredible and mysterious crater was accidentally created by Soviet geologists who set it on fire to prevent the spread of methane gas.

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Darvaza gas crater (Turkmenistan) - The crater has been burning continuously since 1971, fueled by the rich deposits of natural gas in the area.

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Darvaza gas crater (Turkmenistan) - The orange flames are about 70 m in diameter and produce a strong sulfuric smell. The phenomenon impresses tourists from all over the world and is still a mystery to geologists.

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Zhangye Danxia (China) - These colorful mountains are one of the world's most astonishing natural wonders. 

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Zhangye Danxia (China) -

These peculiar and colorful formations in sandstone and other minerals were formed more than 24 million years ago.

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Dark Hedges (Northern Ireland) - This incredible avenue of beech trees is the only one of its kind in the world. This fairy-tale-like wonder is located along Bregagh Road between Armoy and Stranocum in County Antrim, Northern Ireland.

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Dark Hedges (Northern Ireland) - The trees were planted by a family with the purpose of decorating the access to their mansion a few years ago. The result was this incredible natural wonder.

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Fly Geyser (United States) - This incredible natural attraction located in the Gerlach area near Nevada (United States) was accidentally created in 1916 during well drilling.

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Fly Geyser (United States) - However, it was only in the 1960s while exploring for sources of geothermal energy that the geyser began to 'spit' a hot liquid, filled with dissolved minerals and bacteria.

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Fly Geyser (United States) - This green and red wonder is today one of the most incredible natural settings in the world. Its rare formation gives the place an other-worldly quality.

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Blue Pond (Japan) - Located near the town of Biei on the island of Hokkaido, this man-made lagoon is the result of works on the Biei River carried out after the 1988 eruption of Mount Tokachi to protect the town from volcanic mudflows.

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Blue Pond (Japan) - The color is likely the result of accidental presence of colloidal aluminium hydroxide in the water.

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Blue Pond (Japan) - The parched and still-standing trees, along with the color of the water, give the place a magical atmosphere, both in the winter and in the summer.

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Tunnel of Love (Ukraine) - This incredible 7 km tunnel was created by nature and dubbed the 'tunnel of love' by Kleven's residents.

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Tunnel of Love (Ukraine) - The place has become an attraction primarily among couples. Legend has it that if they pass through the tunnel holding hands, they prove their true love for each other.

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Tunnel of Love (Ukraine) - The tunnel is actually a section of industrial railway and, though it's rare, the occasional train still travels through it.

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Las Médulas (Spain) - This incredible mountainous landscape is a pre-historic gold-mining site and the largest open-pit gold mine in the entire Roman Empire. 

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Las Médulas (Spain) - The result was this fascinating landscape that remains intact to this day.

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Ojos del Salar (Chile) - These two incredible lagoons, located in the Salar de Atacama, were the result of a geological study carried out by men.

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Ojos del Salar (Chile) - The result was this incredible natural wonder that fascinates tourists from all over the world. 

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Hamilton Pool (United States) - Here the accident wasn't caused by humans, but by the work of nature. This is a natural pool that was created when the dome of an underground river collapsed due to massive erosion thousands of years ago.

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Hamilton Pool (United States) - The result is a true oasis of crystal-clear water and incredible vegetation that fascinates tourists from all over the world. The Hamilton Pool is located near Austin, Texas (United States).

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To Sua Ocean Trench (Samoa) - This incredible natural pool was created as a result of erosion caused by the water. The result is a magical paradisiacal setting that attracts tourists from all corners of the world.

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Great Blue Hole (Belize) - This incredible water hole is a massive underwater sinkhole. Forming a perfect circle, it is just over 300 m (about 0.2 mi) wide and 124 meters deep. It was formed tens of thousands of years ago, when the sea level was much lower than it is today.

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Bryce Canyon (United States) -

Bryce is a large 'natural amphitheater' formed by erosion caused by the action of wind, water, and ice.

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Bryce Canyon (United States) - It's a true natural wonder that fascinates tourists from all over the world.

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Pamukkale (Turkey) - The Pamukkale formation is the result of thermal springs underneath that caused calcium carbonate spills that later solidified and gave rise to these natural pools.

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Pamukkale (Turkey) -

These gigantic water basins that cascade down a hill are situated near Denizli and are one of Turkey's most fascinating attractions.

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