KF2 Castle Volter: Dolls, Buttons and Trophy Room Guide
The dolls on Castle Volter are the collectibles needed for the map achievement, and the castle also hides buttons that open the valves to a trophy room. That room can only be seen during the boss wave, when the whole museum becomes visible from the trader. The guide is marked as work in progress by its author; if you find a missing item, tell the community. First come the buttons by floor, then the dolls room by room. See also the overview of KF2 collectible maps.

Castle Volter collectible
Buttons
These buttons activate the valves that unlock the trophy room. To view it, you have to wait until it's the boss wave. Then, at the trader, you will see the whole "museum".
First floor
1. In the right hallway of the entrance

In the right hallway of the entrance
2. In the pipe rooms itself

In the pipe rooms itself
3. In the room connecting the games room to the frozen yard

In the room connecting the games room to the frozen yard
4. In the forge

In the forge
Second floor
5. In the connecting hallway between central courtyard and library

In the connecting hallway between central courtyard and library
6. In the thermae (indoor pools)

In the thermae (indoor pools)
Third floor
7. In the staircases connecting floors in the library

In the staircases connecting floors in the library
8. In the hallway connecting the central courtyard to the frozen yard

In the hallway connecting the central courtyard to the frozen yard
9. On the balcony

On the balcony
10. In the sort of backyard with cells

In the sort of backyard with cells
Entrance
11. Under the vehicle at the breached gate

Under the vehicle at the breached gate
Games Room
12. On the pool table

On the pool table
Lobby
13. On the giant gargoyle statue

On the giant gargoyle statue
Pipes Room
14. Between tables

Between tables
Library
15. On the desk just on the right of the entrance (first floor)

On the desk just on the right of the entrance (first floor)
16. On a couch behind the blockade, easier to see from the second floor

On a couch behind the blockade, easier to see from the second floor
17. On a bookcase (second floor)

On a bookcase (second floor)
18. In front of the blockade of the archives room (third floor)

In front of the blockade of the archives room (third floor)
Piano Room
19. Next to a cabinet

Next to a cabinet
Frozen Yard
20. Behind the bench, behind the railing

Behind the bench, behind the railing
21. Above a banner, easier to get if being on the upper floor

Above a banner, easier to get if being on the upper floor
22. In a crate

In a crate
23. Behind a door (top floor)

Behind a door (top floor)
Kitchen
24. On top of a shelf

On top of a shelf
Wine Cellar
25. Against the back wall

Against the back wall
26. On a beam

On a beam
Central Courtyard
27. On the side of the stairs

On the side of the stairs
28. Behind the railing, in the unavailable area

Behind the railing, in the unavailable area
Thermae
29. In the dark, behind the blockade

In the dark, behind the blockade
Painting Gallery
30. Under a couch

Under a couch
Bedroom
31. Under the crushed bed

Under the crushed bed
Broken Stairs
32. On top

On top