How could such a large door be kept secret from everybody outside, apart from the dragon?" [Bilbo] asked. He was only a little hobbit you must remember.

The Road goes ever on and on Down from the door where it began. Now far ahead the Road has gone, And I must follow, if I can, Pursuing it with eager feet, Until it joins some larger way Where many paths and errands meet. And whither then? I cannot say

That's done it! Now I've rung the front-door bell!

It's a dangerous business, going out your door.