However, perhaps the most famous example of a hidden passageway is what modern architects call a "murphy door," most often portrayed as those secret doors behind a bookcase. Secret doors appear in ...

Although @arroz_con_gabichuelas did not show the process of attaching the doors to the bookcase in her video, it should be ...

You know what I mean — when the character pulls out a certain book on a shelf or presses a button, and it reveals a hidden ...