This is a secret door tutorial.

Items:
- A stack of any type of default block. (Cobblestone, Wooden planks, ect.)
- 4 Sticky Pistons
- 1 Stack of redstone (About)
- 6 redstone repeaters

Instructions:
Place 2 sticky pistons standing up against you, place 2 block next to them.
Place 2 more sticky pistons behind you 3 blocks away. Place 2 blocks next to them.
Set up the redsone like image #6 on both sides of the sticky pistons.
Dig around 2 blocks deep, and set up the redstone like image #4.
Remember to add redstone like image #5.
Add restone around the front, and place a lever.
And of course, LOOK AT IMAGE #7! :D LOLOLOLZ

Additional Notes

The instructions will be easier if you look at the images I have posted.