The natural Saturnia Thermal Baths in Tuscany

By © Raimond Spekking / CC BY-SA 4.0 (via Wikimedia Commons), CC BY-SA 4.0, Link

The Terme di Saturnia are a group of springs located a few kilometers from the village of Saturnia in Italy. The springs that feed the baths, which are found in the south-eastern valley, cover a vast territory that stretches from Mount Amiata and the hills of Fiora and Albegna rivers. One legend, according to the Romans, was that the springs were formed by lightning bolts, thrown by Jupiter. The earth split apart to form hot springs that flowed in warm waterfalls.
The sulfurous hot springs, at a temperature of 37.5 °C, are well known for their therapeutic properties, offering relaxation and well being through immersion. The main thermal waterfalls are the Mill Falls – located at an old mill – a series of rock pools that have been turned white by the minerals in the water, which falls in a succession of cascades into the pools.
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“Earth Pyramids” – cone-shaped pillars in South Tyrol

By UwelinoOwn work, CC BY-SA 4.0, Link

The earth pyramids are a natural monument located in South Tyrol. The original name for these earth pyramids is Lahntürme (landslide towers). They are rather unusual formations of their kind which originate from morainic rocks of glacial origin. The columns of the pyramids may be more or less elongated, and the higher they are the thinner they get, ending usually with a stone cover. These earth pyramids are not static, they are constantly evolving, because their life cycle foresees a continuous erosion, or even a final collapse leaving room for new formations.

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The Subway in Zion National Park

By God of WarOwn work, CC BY-SA 3.0, Link

The Subway is a colloquial name for a uniquely shaped slot canyon in Zion National Park in Utah. It is located between two peaks called the North and South Guardian Angels, deep within the Left Fork of North Creek. It is part of the larger Great West Canyon system, which includes both the Left and Right Forks of North Creek.
There are two routes that lead to the Subway. Both are not easy, but one does not require special equipment, while the other can be completed only by experienced hikers. The demanding hike is rewarded with the spectacular sites and an opportunity to freshen up in the Subway’s pools.

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The Eye Of The Sahara

By NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team [Public domain], via Wikimedia Commons

The Richat Structure,also known as  the “Eye of Africa”, is a prominent circular feature in the Sahara’s Adrar Plateau, in west–central Mauritania. The structure is a deeply eroded  dome with a total diameter of almost 50 km, while the center of concentric rings is 30 km width.  These concentric rings are actually alternating layers of sedimentary, metamorphic, and igneous rocks that were pushed upward in a symmetrical anticline, geologic dome, from below due to a small incursion of magma.
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Horseshoe Bend in Arizona

By Joseph Yates josephyates_ ( [CC0], via Wikimedia Commons

Horseshoe Bend is a horseshoe-shaped incised meander of the Colorado River located near the town of Page, Arizona, in the United States. It is accessible via hiking a 1.5-mile (2.4 km) round trip from U.S. Route 89 and can be viewed from the steep cliff above.
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Gljúfrabúi waterfall | a beauty hidden away below steep cliffs

By Luís Ascenso – Imported from 500px (archived version) by the Archive Team. (detail page), CC BY 3.0, Link

Gljúfrafoss or Gljúfrabúi (“one who lives in the canyon”) is a 40 meter (131 feet) high waterfall partially  hidden behind a huge cliff which faces out towards Iceland’s South. Hikers can follow a trail to enter the narrow canyon where the water plummets to a small pool.

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Seven Coloured Earths in Mauritius

By Moongateclimber [CC BY-SA 3.0 or GFDL], from Wikimedia Commons

The Seven Coloured Earths are a geological formation and tourist attraction found in the Chamarel plain of the Rivière Noire District in south-western Mauritius. It is a relatively small area of sand dunes comprising sand of seven distinct colors (approximately red, brown, violet, green, blue, purple and yellow). The main feature of the place is that since these differently colored sands spontaneously settle in different layers, dunes acquire a surrealistic, striped coloring. Another interesting feature of Chamarel’s Coloured Earths is that the dunes seemingly never erode, in spite of Mauritius’ torrential tropical rains. Since the earth was first exposed, rains have carved beautiful patterns into the hillside, creating an effect of earthen meringue.
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