1. 

Vantablack is a nanomaterial that is darker than any substance on Earth.
It absorbs 99.98 percent of the light that hits its surface. This means that the human eye technically sees nothing when it looks at Vantablack, making it the closest thing to staring into a black hole.

2. 

Glaucus Atlanticus is a species of sea slug  nicknamed the "blue angel." This otherworldly creature is as rare as it is beautiful and is only found on the coasts of South Africa and Australia.
It is carnivorous and feeds on other venomous sea creatures, such as the Portuguese man o' war. It collects the venom from its prey in specialised sacs, concentrates it, then uses the venom on future prey.

3. 

Aerogel is an ultralight material made from gel and gas. It's been nicknamed "frozen smoke" or "solid cloud" because of its ethereal appearance.
It is a substance of extremely low density that is actually 99 percent air.
Because it's made primarily of air and air is such a terrible heat conductor, placing a layer of Aerogel between a flower and a flame will protect the flower from getting destroyed.

4. 

The Eucalyptus Deglupta tree grows in Indonesia, Papua New Guinea, and the Philippines. This unique tree has multicolored bark that features bright blue, orange, purple, green, and maroon streaks.
The unusual colours are as strips of bark peel away, the tree's bright green inner bark is revealed. This inner layer slowly matures and turns a range of colours.

5. 

The Salt Cathedral of Zipaquirá is an underground Roman Catholic Church in Colombia that was excavated from a salt mine in 1954. It is completely made of salt and is located 180 meters (590 feet) below the surface of the small town of Zipaquirá.
The cathedral includes a giant salt cross and can accommodate up to 10,000 people, though it has never been filled to capacity.

6. 

Bismuth has a unique "stair step" growth pattern in which the outer edges form more quickly than the inner areas. This results in a crystalline structure that appears to be made of interlocking rainbow squares.

7.

Indonesia's Kawah Ijen volcano is remarkable for its tendency to emit oozing waves of what appears to be blue and purple lava.
Technically, the lava itself isn't blue. The fascinating colouration comes from high quantities of sulfuric gas that emerges along with the lava. When the gas catches fire, it burns with a bright hue that makes the lava appear to be electric blue.

8. 

The Voynich Manuscript is a 240-page medieval tome written in an unknown language that has baffled scholars and code-breakers for years.
The manuscript is believed to have originated sometime between 1404 and 1438. All attempts to translate the book's text or identify the plants depicted in it have failed.

9. 

Ethiopia's Danakil Depression is home to one of the most bizarre-looking landscapes on Earth.
Located in the Afar Triangle, this surreal spot is dotted with crackling lava pools, neon-coloured hot springs, and sparkling salt flats. Poisonous gases swirl around hydrothermal fields, and many of the area's pools are filled with acid.

10. 

Fittingly known as the Cueva de los Cristales or Cave of Crystals , this enchanting cavern is crisscrossed with gleaming gypsum crystals that dwarf human explorers.
The sparkling structures are so pure that scientists are unable to date them using conventional techniques. However, researchers have discovered what is believed to be a 50,000-year-old bacteria sample within one of the crystals.

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Have you heard of any of these before? Which one is your favourite? Comment!

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