Arcadia is the original home of the fae.
Arcadia supposedly lies at the center of the Dreaming, but it has been sealed off since the Sundering. The gates were 'cracked open' by an influx of Glamour at the Apollo 11 moon landing in 1969, allowing the Exile/Return of the sidhe.
While Arcadia remains an inviolate paradise in the minds of the vast majority of fae, a growing number of them fear that it is in dire peril. Some hint that the expulsion sidhe (only the most naive believe they returned voluntarily) is a grave sign of trouble there. Many theorize that all out war has finally broken out between the two courts, a war that will soon draw in the fae of Earth. As some commoners might put it: The nobles muxed it up real good! Even more horrifying to some is the thought that the great walls of Arcadia are under attack by outside forces. Then, perhaps, some say, the newly arrived nobility are here because of a grand retreat — or perhaps they are here to prepare a counterattack. This is a hopeful sign to some, for it means the eventual reconciliation of the two courts. Whether this is true or not, not even the sidhe can say.
Some more "sensitive" changelings (those with a Remembrance of 4 or 5) have occasional dreams of Arcadia. Although these dreams are infuriatingly hazy and contradictory, they seem to indicate that the heart of the Dreaming is close to ruins. Most Kithain do not believe this, of course. Arcadia is eternal in their minds. Any suggestion to the contrary is a heresy. Arcadia fallen? Impossible!
Dreams & Nightmares
Greatest of all the dreams of changelings is the desire to return to the one place forbidden them: Arcadia. Although rumors abound of what Arcadia must surely look like and of the parade that waits beyond its closed gates, no changeling, not even in the Deep Dreaming, can truly say what makes the place so special.
The few Kithain who have managed to reach Arcadia, or a fabulous realm they believed to be Arcadia, have found that all its entrances are sealed. Some foolhardy adventurers have tried to force the gates or fly over the massive walls surrounding the place. All have died in the attempt. As powerful a they are while in the Deep Dreaming, the true fae are more powerful still. They are adept at using their Arts in the Deep Dreaming and suffer no loss of power as a result of Banality. Armies of true fae wait to stop all attackers and are prepared to kill their own to protect the one place left in their world that is free from the mundane. There can be no entry for the changelings for, even from a great distance, the true fae can sense the Banal Shiver that burns shadows into the changelings' hearts and souls.
- CTD: Dreams and Nightmares, p. 60