1. There are tunnels under Disneyland – this tunnel is large enough to pass the vehicle, and can be used for the clowns Disneyland for access to a special garden to wear their costumes (definitely know the costumes mickey, goofy, etc..). Access points are scattered throughout Disneyland, but most people never noticed the tunnel.
Tunnels under Disneyland
2. Main Street Illusion – All the buildings on Main Street at Magic Kingdom and Disneyland, built using perspective lines, making it seem as if Main Street is very much when you walk into the Disneyland castle, and make it look very closely if you want to get out of Disneyland. The window on the second floor are all created much smaller than the window on the first floor, and increasingly in the direction of his palace bangunan2 smaller (if you’ve learned to make perspective drawings must understand is, if not learned might be a little confused).
Main Street Illusion
3. Hidden Mickeys – this is probably the most famous of all Disney secrets. If you’ve never heard of Hidden Mickeys, they just head mickey are scattered throughout all things are made / planned by Walt Disney – EVERYTHING. There are many sites that include the location of Hidden Mickey, but it seems not many know where those places. They are in every attraction Disney, in Disney films, formed by the buildings and gardens which, if viewed from the sky, will be shaped like a mickey, and many other places you never expected.
Hidden Mickeys
4. X-Rated Fun – Not an x-rated you think, but a lot of video on the Disney film that has adirty secret hidden in it. The most famous is the penis is hidden in the palace LittleMermaid, and the word “sex”which is formed from the dust in Lion King movie. There is also a legend of porn on the statue of Walt Disney’s Mickey Mouse the same again – ifviewed from one side of the later seems to Walt Disney
X-Rated Fun
5. Flash Mountain – I mean, so there is a place called Splash Mountain at Disneyland,and there is a camera mounted somewhere on the splash mountain. this camera tophotograph the expressions of people, but that’s the X-ray cameras are worthphotographing the skin of people – so it seems the person is not wearing clothes.
flash mountain
6. There are currently no deaths at Disney – I’m not sure if this is true, but it seems no one has died in Disneyland (though Wikipedia says there are). If someone dies atDisneyland, they will not exactly die when they arrived at the hospital – not in Disneyland.
There’s nothing fun about this, but this is a dark secret, and not many people know aboutit.
source : http://www.klikunic.com/2011/03/rahasia-terselubung-tentang-disney-dan.html (translate by me)
uniqandweirdthing 
There are NO tunnels under Disneyland at all (= California). There are tunnels under The Magic Kingdom, in Walt Disney World. The utilidors were build to overcome the existing problem of staff crossing half the park in non appropriate costumes, to reach their job destination. Also, deliveries (food, merchandise…) go overground in Disneyland, underground in the Magic Kingdom. Main hubs with services are under +- total Fantasyland area, from basements of Cinderella castle up backwards, and under the main street square in front of the railway station. One straight corridor, without services, connects these two, and a loop of corridors with secondary service expansion rooms start right and left from the main street square hub, and end at the large Fantasyland hub, again.