It was in 1889 that the newly formed the Queen Victoria Park Commission (later re-named The Niagara Parks Commission) under took the construction of the first tunnels behind the falls to create the Sheet of Falling water attraction. Prior to that there was a stairway to the base of the falls as early as the mid-1800’s. In 1944 a new 18 metre concrete- lined tunnel was built behind the original passageway. It is still used today. Over the years this attraction has had several renovations and additions as well as name changes. An outdoor observation plaza was built in 1951 at the base of the Canadian Horseshoe Falls.