Natelli Homes will custom make you a secret bookcase door if you're in the Maryland/Virgina area.

This wall panel near the fireplace in the great room opens up to reveal a secret media room passage.

This is a secret bookcase door, loaded with dummy books, built into the library of Oxford Hall in Norfolk, England.

This secret door, posted originally on Reddit, is in the back of a wardrobe leads to a Narnia inspired playroom.

This custom swing-out secret bookcase door, along with a brief description and additional pictures, was posted in the comments of a related Instructables article. It was built to fill the space where a wet bar once stood, and to conceal ...

This wide secret bookcase door featured on the DIY Network swings out of the wall to reveal a hidden storage room.

Houzz showcases a lot of creative storage and design ideas, like this swing-in secret bookcase door to a concealed attic/closet room.

Here's a highly detailed secret door in a little used corner of a room. The handle makes the door visible, but it likely wouldn't be obvious to a casual visitor.

Secret bookcase door in library just after construction

This custom built swing-in hidden bookcase door opens to reveal a secret room and staircase.