In DI in the secret place.... There is a mysterious door... What do you think there is inside?

 

 

 

PS: Thanks to Sora96 for the idea

Maybe it's the "secret" door to disney castle! Darn you beta. All your glory we never get to experience!

what if Destiny Islands is complelty parallel with the realm of darkness, specifically the dark margian. think about it. i mean the whole bottle thing. it really just floated between realms?

 

maybe thats something they'll uncover in KH3 or even later

 

just a thought

DC's inside that door, and you have tp worship him when you open that door

 

Probably the Keyhole.

Now that I think about it, that might have been a scene in the manga and thus non-canon. Never mind.

 

But if we never saw it in the game, how do we know it didn't happen?

...

 

It's the door to the world's heart. Destiny Island's keyhole. I thought that was pretty obvious.

 

Plenty of keyholes are hidden in plain sight, such as the one in Alice in Wonderland, or Tarzan. Heck, the one in Olympus Coliseum was just sitting under a block. In the vestibule, where people pass by all the time. You could argue that the keyhole seen by Riku in kh1 was just any keyhole...ecxept for the fact that only Riku seemed to be able to see it, implying that it is indeed the world's keyhole. In fact, I'm almost certain that Nomura said as much in an interview somewhere, but I'm too lazy to look it up.

 

Also, I see some arguments about why heartless weren't at Destiny Islands; I think its pretty heavily implied that not all of the heartless attacked all of the worlds at once; however, from DDD, we could probably also say that the heartless didn't come there for Riku and Kairi (both important to his plan, Riku as a vessel, Kairi a PoH) until he was good and ready for the heartless to attack there. Once the heartless did arrive, they found the keyhole with relative ease and destroyed the world almost immediately. Once the heartless come, you see a bunch of darkness coming from that door, and are blown into the last ruins of the world as it's sucked into darkness; this darkness coming out of the door represents the heartless taking the world's heart and turning it to darkness as the rest of the world is destroyed. Kairi's body is sucked into the darkness as her heart passes into Sora, and Sora is eventually sucked into the darkness, arriving in Traverse Town via corridor of darkness.

 

Sorry to post this long rant, but...it's pretty obvious that that's what this door is.

But, I will say, as I always say when asked this question. I think that door is in someway related to the door of light/darkness. Although the majority of people state the door is simply the world's keyhole, I have to disagree. For one thing, it just seems too obvious. Yes, Destiny Isle is a small world and that cave was hidden but a couple of five year olds were able to find it. Destiny Isle's protection is ridiculous if that's the case.

 

Read the post above mine.

 

But my second reason for thinking this is that it's said that the door has opened before and inside is darkness which was found by Riku. Later, when Sora becomes the Keyblade Wielder, the door opens and darkness is all that's released. And then the Door To Light, allows for Sora and Riku to return home and somehow a message in a bottle was somehow able to cross worlds, from DI to the Dark Meridian.

Let's face it, something is up with Destiny Isle. It's also a world devoid of heartless despite having a Princess of Heart there. That seems really odd to me. Maleficent knows where Kairi lives and she probably also knows she's un-protected. It makes no sense to me why she didn't try to kidnap Kairi again.

 

Also on the post above me, but there's also something else: The Secret Ansem Reports from KHII imply that by opening a world's Keyhole you release the world's heart's darkness.

first i thought it was the door to darkness

 

mostly because the only time we see it open it release darkness on the destiny islands

 

in this scene

http://youtu.be/bvko94OiqG4?t=2m52s