'This is by far the oldest': Scientists discover 3.47 billion year old meteorite impact crater in Australian outback
Mount Roraima: A 'lost world' isolated for millions of years that indigenous people call 'home of the gods'
The ancient Egyptian city of Alexandria, the birthplace of Cleopatra, is collapsing into the sea at unprecedented speed
A stunning photo taken from the ISS shows a 'giant jet' of upward-striking lightning towering 50 miles above New Orleans.