Environment
It’s 50 million years old, the size of Wembley Stadium and could fit 12 Boeing 747s inside – but the only way in is via a 100-metre plunge
This spectacular cave in Oman is one of the largest cave chambers in the world.
An elephant-like animal was discovered in this gigantic underwater cave. And that’s not all
Sac Actun is one of the most impressive submerged cave systems on the planet. Here's how several decades of underwater exploration has unveiled Mexico’s ancient subterranean world and the unique wildlife thriving in the dark.
"We have to leave right now. If we just hang around, we’re all going to die.” The cave that's so deep it could swallow six Eiffel Towers
This cave in western Georgia is one of the most extraordinary in the world.
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Sunken warships fill this eerie lagoon – and they're scattered with gas masks, skulls and bullet casings
Frozen in time beneath the turquoise waters of Chuuk Lagoon in the Pacific Ocean, a sunken fleet of 60 World War II ships forms an incredible underwater museum.
These are the deadliest sinkholes on Earth
While one massive collapse famously swallowed an entire building, another continues to claim lives due to a lethally tempting underwater arch
It's bigger than France, Germany and Spain combined, is home to rainforests, savannahs, swamps and some of the world’s deadliest, strangest wildlife
It can seem eerily still in the forests of the Congo River in West Africa – and yet a diverse array of species inhabits this vast and mysterious land.
It's home to 900 fish species and one of the rarest animals on Earth – and was dubbed the 'aquarium of the world' by Jacques Cousteau
The Sea of Cortez in the Pacific Ocean is thought to be one of the most ecologically diverse seas
on the planet
At 130km across, it's the world’s largest natural mirror – but this otherworldly landscape is stranger than it looks, and has starred in Star Wars
Salar de Uyuni is an enormous desert of white salt in Bolivia. Here's everything you need to know...
It can swallow 5 Empire State Buildings, is as long as Portugal – and is home to a deadly but rare big cat
The Yarlung Tsangpo Grand Canyon and its river are a sight to see. Here's why...
It's one of the oldest and driest deserts in the world, is 5 times drier than the Sahara – and it's about to bloom with millions of flowers
The Atacama Desert is one of the most unique landscapes on Earth.
"It's famous for the mighty river that snakes through its forests, but high above the canopy, another vast river is moving…" – Discover the Amazon's 'Flying River'
Here's how flying rivers in the Amazon contribute to moisture distribution across the continent
“It triggered catastrophic global cooling and was twice the size of the one that killed the dinosaurs.” 6 deadliest, most apocalyptic asteroids to ever hit Earth
We’re not alone in space; swirling above our heads at any one moment are millions of rocks that, with only the slightest nudge, could be sent hurtling onto a collision course with Earth…
"Hot mud, boiling – bubbling – pools where nothing survives, sulphur-stinking vents and eruptions of steam that blast metres into the sky"
Here's everything you didn't know about Iceland's famous and bizarre geysers
2,000 pairs of underpants buried across Switzerland. Here’s what scientists discovered when they dug them up
A citizen science project in Switzerland shows how underwear and teabags decompose in different soil types, offering clues about the health of our subterranean world.
It’s one of the driest places on Earth. Now images from space show “rarely seen” snowfall in the Chilean desert
Scientists attribute the unusually wet winter in Chile to the strengthening El Niño.
"It produced a 12km high eruption plume, a large volume of floating pumice, and an island almost a mile-wide with cliffs 30-50m high"
The first recorded eruption of Home Reef, Tonga, was in the mid-19th century and it has had several periods of eruptions in the years since.
People started building artificial beaver dams in California. Now something "mind blowing" is happening
Following the construction of the dams, one river saw juvenile coho salmon survival rates soar from 8% to 60%.
It’s the size of Texas, stores 70 billion tonnes of carbon and deadly predators roam its harsh, remote landscape
The West Siberian Lowland is the world’s largest high-latitude wetland and contains the biggest peatland
Was it the lost city of Atlantis or a crashed UFO? The strange Ferris wheel-sized circle found at the bottom of the sea
The Baltic Sea Anomaly has been the subject of mystery and debate for many years
It looks like spaghetti, doesn’t have a gut or mouth – and has been feeding on bioplastics for millions of years
Long before we invented biodegradable plastic, nature had its own version.
No one lives on this remote Russian island – but it does have a mysterious graveyard of gigantic, 600-year-old whale bones
Located off the coast of the Russian Far East, Yttygran Island is home to a mysterious graveyard.
Epic footage shows birds soaring over massive waterfall. Can you guess the location?
Can you guess where this incredible footage was taken?
Iceland’s famous Blue Lagoon looks like a natural hot spring – but the truth is much stranger
It starts in the Pacific but can affect the entire planet… The strange climate phenomenon that can wreak havoc with wildlife and weather
Mark Carwardine reveals what impact this series of climatic changes has on wildlife.
