Modern waterfront cabin.

alte Säge (old sawmill)

WHAT?! Secret passage bookshelf that leads to a secret library.

10 Drool-Worthy Secret Passage Bookshelves

As a bibliophile I truly appreciate this idea, BUT, my secret room would not be more bookcases.just sayin. "A bookcase that leads to a hidden room with.wait for it.more bookcases!