Not really sure this counts as "an unprecedented icy structure"; there's been a semi-sober alaskan ice climber, part of the "Alaskan Alpine Club" building these

Not really sure this counts as "an unprecedented icy structure"; there's been a semi-sober alaskan ice climber, part of the "Alaskan Alpine Club" building these every winter out of sprinkler parts and an old garden hose, appears to be the same scale: http://alaskanalpineclub.org/old/IceTower/IceTowers.html http://alaskanalpineclub.org/old/IceTower/IceTowers.html