Secret one
Find this sitting room, which is left of the main staircase. Shoot the picture of Hitler:

This reveals a hidden button:

Shoot the button:

This causes a door on the left side of the staircase to open:

Go through, into a secret room:

Secret two
Find this sitting area, which is located near the exit of the level:

Examine the set of fire irons.

USE the leftmost fire iron (notice: you don't see the usual graphic that shows you can use something):

This makes the fireplace move aside, revealing a secret chamber:

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