Columbia University has an extensive tunnel system connecting most buildings on campus and acting as conduits for steam, electricity, telecommunications, and other infrastructure. The oldest tunnels are from the mental asylum that existed before the Morningside Campus was built.[1] These tunnels are small and extremely hot, and they connect to Buell/La Maison Francaise, the one building remaining from the asylum. The steam tunnel system between Hamilton, Kent, Philosophy, and Fayerweather connects to these old tunnels.