This was probably the home of Mr.Yoop, a terrible giant whom I have seen confined in a cage, a long way from here.

Therefore this castle is likely to be empty and we may use it in any way we please." "Yes, yes," said the Tin Emperor, nodding; "I also remember Mr.Yoop.
But how are we to get into his deserted castle?
The latch of the door is so far above our heads that none of us can reach it." They considered this problem for a while, and then Woot said to the Tin Man: "If I stand upon your shoulders, I think I can unlatch the door." "Climb up, then," was the reply, and when the boy was perched upon the tin shoulders of Nick Chopper, he was just able to reach the latch and raise it.
At once the door swung open, its great hinges making a groaning sound as if in protest, so Woot leaped down and followed his companions into a big, bare hallway.

Scarcely were the three inside, however, when they heard the door slam shut behind them, and this astonished them because no one had touched it.

It had closed of its own accord, as if by magic.
Moreover, the latch was on the outside, and the thought occurred to each one of them that they were now prisoners in this unknown castle.
"However," mumbled the Scarecrow, "we are not to blame for what cannot be helped; so let us push bravely ahead and see what may be seen." It was quite dark in the hallway, now that the outside door was shut, so as they stumbled along a stone passage they kept close together, not knowing what danger was likely to befall them.
Suddenly a soft glow enveloped them.

It grew brighter, until they could see their surroundings distinctly.