The Screaming Tunnel is a small limestone tunnel, running underneath what once was the Grand Trunk Railway lines (now the Canadian National Railways), located in the northwest corner of Niagara Falls, Ontario, Canada. The actual location of the attraction is just off Warner Road. Often thought to be a railway tunnel, it was actually constructed only as a drainage tunnel so that water can be removed from the farmlands. This water would go underneath the Grand Trunk Railway and down to the valley below.