Portal of Doors

The Portal of Doors is a place where Regina and Jefferson found themselves after entering Jefferson's hat using magic. The place seems has 12 different doors that lead to 12 different worlds that are inconnected with one another. They enter the Mirror Door in the episode Hat Trick which takes them to Wonderland. The location of the other 11 doors hasn't been revealed yet.

Trivia
Each door seems to reflect the style of the world behind it. The currently known doors are:
 * 1) Grey Door: ?
 * 2) Pink Brick Door: ?
 * 3) Green Door with a Hole/Mirror: ?
 * 4) Brown Door with Trees: ?
 * 5) Blue Door with four Holes/Knobs (with possible scales): ?
 * 6) Medieval Brown and Grey Door: ?
 * 7) Oriental Style Red Door with Golden Knobs: ?
 * 8) Green Curtain Door with the Oz Logo: ?
 * 9) Mirror Door (known as "Looking Glass"): Wonderland
 * 10) Coffin-like Door (or Corridor): ?
 * 11) Normal Door with a Keyhole: ?