The Main Campus is the primary campus of North Carolina State University, located in Raleigh, North Carolina, US, inside the Beltline. Notable features of Main Campus include the Bell Tower and D. H. Hill Library. The campus is known for its distinctive red brick buildings, sidewalks, plazas, and sculptures; some are dotted with decorative brick mosaics. University Plaza is nicknamed "The Brickyard" because it is mostly a flat, open, bricked area.
The Main Campus is divided into three sections: a North Campus, a Central Campus, and a South Campus. The North and Central campuses are separated by the railroad tracks that run through the area. Pedestrian access between these two campuses is by one of five locations: three pedestrian tunnels, an underpass at Dan Allen Drive, or a bridge at Pullen Road. Of the three pedestrian tunnels, the Free Expression Tunnel is the largest; the other two, nicknamed the Reynolds Tunnel and the Thompson Tunnel, are much more narrow and do not have handicap access ramps.