No, this isn't Superman's Fortress of Solitude. But the Cave of Crystals beneath the Mexican desert is every bit as otherworldly.
Covering a whopping 24,000 kilometres, it’s certainly not for the faint of heart (or foot).
Did you know Switzerland’s mountain valleys are littered with between 10,000 and 15,000 heavily fortified and occasionally well-camouflaged bunkers?
Pigeons beware: Adam Baz is bringing falconry out of the forest and into the city.
Fishing 101: don’t forget your helmet and cigarettes.
In a small village in China, a group of “spider-men” and women free-climb massive cave walls for medicinal herbs. Just don’t look down.
How not to be a walking tourist stereotype in five easy steps.
It’s pretty nippy in the Antarctic right now, so we’ll have to settle for tour guide Sam Edmonds' stunning overhead images of the frozen continent.
Long considered unclimbable, Tasmania’s treacherous Federation Peak has finally been bested – and there’s plenty of leech-filled footage to prove it.
This water kingdom in southern Iraq was almost destroyed by Saddam Hussein – and its unique woven reed architecture along with it. But now they're both making a comeback.
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