Great South Door

The Great South Door is an outside-facing door in High Castle with a crack in it "where the Dragon King hit it with his battering ram." According to Patrick, the Dragon King "had a bet with King Conrad... which is why they never mended the door and why it's not guarded."

In The Secret Country, the children exit by this door when leaving High Castle to try to get back home after their first full day in the Secret Country.