Portal of Doors

The Portal of Doors is, as the name implies, a portal of doors made by Jefferson's hat. The portal is a room of an unknown number of doors.

History
On a job for Rumplstiltskin to retrieve the ruby slippers from Oz, Jefferson traveled here. However, he failed to get the slippers as they went to Earth; a land without magic. Instead, he stole the Wicked Witch's crystal ball. ("The Doctor")

Jefferson and the Evil Queen came here to visit Wonderland via the Looking Glass Door. During this short visit, many doors were visible in the background. ("Hat Trick")

Doors

 * 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: Oz
 * 9) Looking Glass Door: Wonderland
 * 10) Coffin-like Door  Frankenstein's Realm
 * 11) Normal Door with a Keyhole  Storybrooke (Needs Key)

Trivia

 * According to the Mad Hatter, the number of people that go in, must come out. ("Hat Trick")
 * It can be assumed that some of the doors lead to Neverland, Fairytale Land, and Frankenstein's Realm.
 * This portal can't access Storybrooke due to the lack of magic.