There are several synonyms for the phrase "am fascinated with," including "am intrigued by," "am captivated by," "am spellbound by," and "am engrossed with." These phrases all convey a strong interest in and attraction to something. They can be used to describe a particular subject matter, hobby, or even a person. Whether it's a work of art, a scientific breakthrough, or a captivating story, there are endless things to be fascinated by in this world. Using synonyms such as these can help to add variety and depth to one's language, allowing for a more nuanced and expressive way of communicating.