Science fiction and fantasy stories transport readers to new worlds, from the wondrous to the weird. Solid world building is essential to invite readers into your story and keep them immersed. How can writers construct believable worlds in unbelievable settings? How can we bring authenticity to these imaginary places? How do we develop an internal logic for our stories that is both fantastical and believable? When imagination and writing craft successfully intersect, the results can be out of this world! If you are an aspiring speculative fiction writer, this presentation is for you.