Children's fairy picture book.

I found this book in the library around 1999, I was about 6. It was a hardcover children's book with just a few words, I can't remember if there was an actual storyline. What I remember most was every picture was super detailed and slightly creepy. Doors and faces in weird places, almost showing a hidden world in our own. Fairies hiding in the crevasses of buildings and such. The color scheme was fairly dark and it seemed almost like a puzzle book.