Armored Fortress

The "Armored Fortress" as describe by was the first known rendition of what would become Canterlot Castle.

History
It was built during the Age of Heroes by a group of architects who feared for their lives as the wildlife of the forest. The fortress was to be massive and imposing, but was eventually scrapped to become a beacon of hope instead after Luna discussed with the animals and realized the massive size would destroy much of their homes.