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Antelope Canyon, United States - This cave is located in the state of Arizona. The beam of light that enters it makes the cave look particularly orangy. 

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Antelope Canyon, United States - The reflected colors create a unique but natural effect inside the cave, making it one of the most beautiful and most unusual on the planet.

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Antelope Canyon, United States - If you want to visit a real natural wonder then head to Antelope Canyon and drink in its incredible natural formations!

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Marble Cathedral, Chile - The caves on the General Carrera lake, in the region of Puerto Río Tranquilo, are masses of marble that have been eroded by the water.

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Marble Cathedral, Chile - These caves are one of the most popular natural attractions for visitors to the area, mainly because of their exotic rocky formations on the inside.

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Fingal's Cave, Scotland - This imposing cave is located in the middle of the sea, on the uninhabited Isle of Staffa, and is part of a natural reserve.

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Fingal's Cave, Scotland - The size and structure of this cave are part of the reason why it's so well-known - its natural acoustics.

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Devetashka cave, Bulgaria - This cave can be found two km away from the Bulgarian town of Devetaki, on the east bank of the river Osam.

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Devetashka cave, Bulgaria - There are seven openings in the central ceiling of the cave that allow light to enter it. Devetashka is also home to thousands of bats.

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Sơn Đoòng cave, Vietnam - This cave is located in the Phong Nha-Kẻ Bàng national park and has been a UNESCO World Heritage Site since 2003.

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Sơn Đoòng cave, Vietnam - Most of these caves are around 200 meters high and 150 meters wide. There are many incredible mysteries, rocks, and minerals to be discovered inside!

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Sơn Đoòng cave, Vietnam - In 2009, a group of English scientists explored this location. It is now considered the largest cave in the world.

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Blue Grotto, Italy - The Blue Grotto is situated on the Italian island of Capri and is one of the most stunning caves in the world.

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Blue Grotto, Italy - The light that enters from the outside is reflected in the waters in the cave, creating a mesmerizing shimmering blue effect.

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Škocjan Caves, Slovenia - This series of limestone caves are located in the region of Kras, in the southeast of Slovenia.

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Škocjan Caves, Slovenia - The caves contain almost five kilometers of underground passages and several waterfalls, with some caves being over 20 meters deep.

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Crystal Caves, Bermuda - This is the most famous of several incredible underground caves in Bermuda, and it is located in the district of Hamilton, close to Castle Harbour.

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Crystal Caves, Bermuda - The Crystal Caves measure about 500 meters wide and are over 60 meters deep. Their exotic beauty make them some of the most incredible caves on the planet.

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Phraya Nakhon cave, Thailand - This cave is located in the Khao Sam Roi Yot National Park and is another that stands out for its natural beauty.

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Phraya Nakhon cave, Thailand - To appreciate its beauty, visitors must climb up about 400 meters of steep steps.

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Ellora caves, India - The Ellora caves are a real open air archaeological museum. A total of 34 artificial caves were carved into two km of the Charanandri Hills.

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Ellora caves, India - The caves are located roughly 30 km from the city of Aurangabad, in the state of Maharashtra. You'll find 12 Buddhist, 17 Hindu, and five Jain caves here.

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Vatnajökull, Iceland - This glacier is one of the largest ice caps in Europe.

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Vatnajökull, Iceland - Inside you'll be able to marvel at the incredible blue colors that form naturally. It's without a doubt one of the most fascinating views in the world.

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Cueva Ventana, Puerto Rico -

This cave was formed in a limestone cliff, and is one of Puerto Rico's most incredible natural attractions.

It's worth visiting the inside of the cave, which has stunning rock formations and breathtaking views.

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Uplistsikhe, Georgia - Uplistsikhe is a series of ancient caves and tunnels of all shapes and sizes.

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Uplistsikhe, Georgia - It was one of the first urban centers of the Kingdom of Kartli, and today has become a fascinating tourist attraction that stands out for its incredible rocky features.

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Reed Flute Cave, China - Located five km away from the center of Guilin, this cave has natural limestone rock and is filled with stalactites, stalagmites, and other stunning rock formations.

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Reed Flute Cave, China -

The artificial lights placed inside the cave create a magical scene that you should see at least once in your life.

See also: Discover some of the world's most dangerous volcanoes

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