There is some evidence Wonderland has close ties with SB that has yet to be brought up here. From episode 12, Skin Deep, we find out that the name of the bar where girls’ night takes place is The Rabbit Hole (i.e. the white rabbit from Alice in Wonderland). This makes me think that Wonderland existed in FTL and then became part of SB, the way the other kingdoms of the Enchanted Forest ended up in SB.
In the red circle, there is a rabbit emblem in the background. Also, you may notice the decor of the bar’s table cloths is based on the Queen of Hearts and her guards from the Disney version of the story.
Based on a post from OUAT Fan Podcast blog: http://ouat.roneyzone.com/ouat-we-know-the-name-of-the-bar-that-sean-proposed-to-ashley/
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy