How can I eaves drop on all the conversations going on

Hint 1 of 7:

You need to be able to stop, look, and listen without being seen.

Hint 2 of 7:

Have you looked at all the interesting pictures?

Hint 3 of 7:

How could you see things through the eyes of the pictures?

Hint 4 of 7:

THere are secret rooms behind the pictures.

Hint 5 of 7:

There are four secret entrances to the spy passages.

Hint 6 of 7:

Open the two upstairs with "Push cabinet".

Hint 7 of 7:

Open the two downstairs with "Push mirror" and "Push clock".