Baltimore Polytechnic Institute (BPI), known most commonly as Poly, is a magnet high school in Baltimore, Maryland. Though established as an all male trade school Poly now serves as a coeducational college preparatory institution that emphasizes mathematics, the sciences, and engineering. Poly is located on a 53-acre (21 ha) tract of land in North Baltimore at Falls Road and Cold Spring Lane, bordering Roland Park to the east and I-83 to the west. Poly and Western High School, originally Poly's sister school, are located on the same campus and share several amenities including a cafeteria, auditorium, and athletic fields. Baltimore City College and Poly share a long standing rivalry centered around the annual Poly City football game. Poly is a Maryland Blue Ribbon School of Excellence.