Excuse our swooning. We're adding this to our birthday lists, Valentine's lists, get-me-a-freaking-present lists, any damn lists we can find. It's a guide to the world's best tree houses from the makers of the world's best coffee table books, Taschen.

Tree Houses: Fairy Tale Castles in the Air features photos and illustrations of 50 high-flying abodes as well as interviews with the architects who designed them, and we think it's pretty sweet.

Pop here if you'd like to see more.