Shhh, Don't Tell the Neighbors
This is one serious secret door. In fact, you can hardly call it a door, being it is the entire exterior of a house(!)
"Our home sits on a small private grass airstrip on the shores of Lake Harney in Florida. This side faces the taxi way and the other side Lake Harney. At this point we're about 65% done."
Wow, I have to admit this kinda puts all of WonderHowTo's garage HowTo projects to shame...