This media center and library, featured on the Custom Made blog, includes hidden storage behind secret bookcase doors and drawers.

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.

These bookcase doors slide sideways to reveal a fold out Murphy bed made by the Wall Bed Factory.

These secret doors with shelves attached conceal the most valuable vintages of wine in this custom wine cellar featured on Houzz.

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 featured this secret bookcase door the accesses a hidden storage closet under the staircase.