here is a site that tells you where all of these holes are at so if you want to see them in person you can /www.slightlywarped.com/crapfactory/curiosities/greatbighole.htm AND THIS ONE HAS THE REST /www.slightlywarped.com/crapfactory/curiosities/moregreatbigholes.htm
To 7: This impressive sight is Diavik Mine in Northern Canada about 300 km from Yellowknife. The mine is so huge and so remote that it has its own airport that can accommodate a Boeing 737. Because of its location, the mine is completely surrounded by ice in the wintertime making it appear that this extraordinary hole is on land and not on the sea
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