The Four Sisters on Temperance Street are a series of stone row houses. They were built in the late 19th century with the surplus stone from Cabot Tower and stone remaining from the destroyed St. George's Hospital. The Four Sisters have their unique historic values in various ways. They are designated as Registered Heritage Structures by the Heritage Foundation of Newfoundland and Labrador in 1988 and get renovated in 2015. They are built on a steep hill down toward St. John's Harbour, that is why if you make the ground horizontal, the houses will look tilting.