Southwest of the Court of North Carolina is another landmark, the Free Expression Tunnel. The Tunnel functions as one of three pedestrian tunnels underneath the railroad tracks separating North Campus and Central Campus. This particular tunnel is the site of sanctioned graffiti; anyone may paint there, and it is often the place for political statements, personal messages, and art. This tunnel also serves as a way to advertise events going on around campus. In 2008 racist and threatening graffiti directed at (then) President-elect Barack Obama prompted an investigation from the United States Secret Service. Students held a "Unity Rally" in response to denounce the acts of racism.