kimberley big hole - south africa
apparently the largest ever hand-dug excavation in the world, this 1097 metre deep mine yielded over 3 tonnes of diamonds before being closed in 1914.
the amount of earth removed by workers is estimated to total 22.5 million tonnes.
bingham canyon - utah
this is supposedly the largest man-made excavation on earth. extraction began in 1863 and still continues today, the pit increasing in size constantly.. in its current state the hole is 3/4 mile deep and 2.5 miles wide.
great blue hole, belize:
situated 60 miles off the mainland of belize is this incredible ??geographical phenomenon ?? known as a blue hole. there are numerous blue holes around the world but none as stunning as this one.