Study: Biggest Ocean in the World is.. Underground?
A groundbreaking discovery by researchers reveals an enormous water reservoir deep beneath the Earth's surface.
This Giant Tank Will Unlock the Universe’s Big Mysteries
Japan is building a huge underground tank inside a mountain to help unlock the many mysteries of the universe.
Are You Brave Enough to Visit the World's Largest Cave?
For the humble price of $ 3,000 and a year's waiting list, you too could visit this place. Is it worth it?
8 Magnificent Mines Around the World
Discover these 8 mines from around the world
Visit Derinkuyu, an Underground City From a Millenia Ago
Visit Derinkuyu, a hidden underground city in Cappadocia, Turkey.
You Won't Believe What This Man Builds Single Handedly
Watch as this man single handed builds a beautiful underground house, complete with pool.
Creepy Yet Majestic: Underground Burial Sites
Here are 7 of the most intriguing crypts, catacombs and ossuaries that are located around the world.
This is How the World's Very First Subway Was Built!
Ever wondered how the world's very first subway system was built? This TED-Ed video reveals all!
Witness The Magical World of Brazil’s Terra Ronca Cave
Treasures buried in the heart of the earth are not only silver and gold but also rare natural wonders. This is the Terra Runica Cave, enjoy your tour!
Wow! These Underground Dwellings Are Utterly Amazing
Impressive feats of architecture that are hidden underground. These are bound to amaze you.
This Dark Underground Chamber Contains Millions of Shells
This winding underground passageway contains millions of beautifully arranged shells. But why?
The Incredible Things People Have Dug Up in Their Back Yards
You might be surprised to know that it's possible to find something ancient in your back yard, just like these people. Take a look at these amazing finds.