Camelot

Camelot is a realm famed for containing the legendary sword of Excalibur.

Before the Curse
At an unknown point, Rumplestiltskin visits Camelot where he retrieves a magical gauntlet that has the ability to guide someone to another person's weakness. When describing his visit to Belle, Rumple states that it was "good for me, not so good for Camelot."

When Prince Charming led Snow White to a fake version of Excalibur, he told her that it was forged by a mage called Merlin, in the realm of Camelot. Later, when Snow discovers the sword is a fake, Rumplestiltskin tells her "everyone knows it's in Camelot", referring to the real Excalibur.