Castle spawnkeep

From Minecraftia Wiki

Castle Spawnkeep is the military fortress overlooking the city of Oldspawn. It was originally created in a rush by Kythira as a gift to the - unbeknownst to them - head of the Rebel Alliance, but it almost immediately fell into the hands of Helmsdeep, after which it was turned into a glorified toll booth to the north of the Riverlands. After the annexation of the Riverlands by the Empire of Kythira in the Third Era, the castle became a public park.