World’s most incredible secrets from ‘Well of Hell’ to ‘Eye of the Sahara’ with unexplained ‘eternal flame’ waterfall

INCREDIBLE pictures reveal the world's most incredible natural wonders from the 'Well of Hell' to the 'Eye of the Sahara' and the 'eternal flame' waterfall.

Scattered around the globe on land and in the sea alike, these eye-catching formations have had even the most experienced explorer's heads in a spin.

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Well of Hell

Hidden in a desert in Yemen is a 400ft pit so mysterious that terrified locals refuse to go anywhere near it out of fear it is home to evil spirits.

Thought to be millions of years old, the 100ft wide hole officially known as the Well of Barhout has been branded the Well of Hell.

Stories have circulated for centuries about mythical figures such as jinns or genies living in the well - and some regard it as the gate of hell.

This year, for what is believed to be for the first time ever, a team of intrepid adventures ventured into the cave - and were shocked to discover a labyrinth of snakes.

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Eye of Sahara

For centuries, astronauts have used the Eye of Sahara as a visual landmark.

Resembling a bullseye, the incredible 30mile swirl in Mauritania, Africa - known as the Richat Structure - is visible from the International Space Station.

It is thought to predate the appearance of life on Earth and is believed to be a crater caused by a meteorite.

Geologists believe the fascinating formation was once a dome that has eroded over time.

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Eternal Flame Falls

Tucked inside a waterfall in America is an enigmatic flame that is visible almost all year round.

The bewitching glow can be seen by visitors to New York's Chestnut Ridge Park behind a staggered waterfall.

A small grotto at the waterfall's base emits a natural methane gas - keeping the flame alight as it seeps through cracks in the rocks.

Occasionally, the flame is extinguished - but can easily be re-lit with just a lighter.

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Bermuda Triangle

The Bermuda Triangle is arguably as mysterious as they come.

Otherwise known as the Devil's Triangle, it is an area covering around 500,000 square miles between Bermuda, Miami in Florida and San Juan in Puerto Rico.

More than 20 planes and 50 ships are said to have oddly disappeared with no obvious explanation in the region.

Some have pointed the finger at supernatural activity, while others blame rogue waves or unusual local magnetic anomalies.

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Blood Falls

Perhaps one of the world's creepiest wonders is Antarctica's Blood Falls.

What looks like a scene from a horror film is actually a scientific sensation as blood-red liquid oozes out onto the paper white ice.

Around two million years ago, a saltwater pool became trapped inside Taylor Glacier.

Without air, the lake's high iron content and salinity caused the rust-red colour of the water that eventually began to seep out of a fissure onto the ice-covered surface of West Lake Bonney

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Great Blue Hole

Just off the coast of Belize lies this stunning - yet terrifying - marine sinkhole.

Plunging more than 400ft deep into the ocean, it is the world's biggest sinkhole - measuring up at more than 1,000ft across.

In 2018, two submarines delved into the giant sinkhole in a bid to chart its interior.

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Using a sonar scanning system, the team were able to almost complete a 3D map of the hole - while finding the bodies of two divers at the bottom who had previously tried to explore the strange formation.

It was formed tens of thousands of years ago when sea levels were much lower, during several episodes of quaternary glaciation.