Egypt

Currently doing the rounds in the mainstream press, this is the recently discovered Kebira meteorite crater in the western desert of Egypt. At 31 kilometers across Kebira utterly dwarfs Arizona's famous Barringer meteor crater (which is only 1.2 kilometres in…

The Richat Structure in central Mauritania is a stunning geological structure 50 kilometres across (Wikipedia entry). Once thought to be an impact crater, it is actually a sedimentary formation that has eroded flat over many eons. Apparently there's a hotel…

Of the 7 wonders of the ancient world, the Pyramids at Giza are the only ones remaining, they are over 6000 years old and are constructed from over 25 million tonnes of limestone. The pyramids were built as tombs for…