Outer Gates

The Outer Gates is the entrance to Outside. To open the Outer Gates breaks the Seventh Law of Magic.

Description
In Cold Days, The Outer Gates are described as large (possibly the largest) entrance to the universe. Set in a gigantic wall, between two towers each the size of the Chrysler building, they are powerfully warded, and constantly defended from Outsiders by the Gatekeeper and the immense army of the Winter Court. (Chapter ref?)

About
Outsiders are beings from beyond the Gates, and are among the deadliest threats to humanity known – their sheer existence is antithetical to the universe. (Chapter ref?)