Secret wall panel door
Secret bookcase door in billiard/recreation room
This sliding secret bookcase door conceals a laundry room. It uses skateboard wheels, and could be used to hide any number of different entrances.
Ikea bookcase used as a hidden sliding bookshelf door
This rec room has a secret bookcase door entrance.
Secret Bookcase Door To Zombie Apocalypse Safe Room
Secret Home Theater Door
Secret Bookcase Door and Tunnel
Spot the secret door - Biblioteca Angelica, Rome.
Stairs behind secret mirror passage