Now, this was a fascinating find! A short (about 2 km, one way) hike west from the Heart Creek parking lot near Canmore, Alberta leads you to this gigantic cave carved out of the base of Mount McGillivray. My hubby and I headed out there a few weeks ago to check it out.
There is plenty of speculation about the purpose of this huge excavation, but it seems that a private enterprise called The Rocky Mountain Vault and Archive Company started digging it out in the late 1960’s, presumably so that they could rent space to individuals and corporations to store documents (in the event that the Cold War took a nasty turn, perhaps?). You can read more about their ambitious plans for the site here (it was slated to become operational in 1970) – but there doesn’t seem to be any information about why they never finished the project. At any rate, it’s an amazing place to visit (and fortunately, there weren’t any creepy Hallowe’en masks hanging from the ceiling when we went – my heart wouldn’t have been able to handle the fright).
Looking towards the entranceway from inside the vault.