 It is one of the most densely populated areas of the city.The area is known historically for containing a range of red brick Victorian and Georgian terraced avenues along streets such as Buckingham Street and Gardiner Street as well as for the Monto red-light district of Dublin and the Gloucester Diamond.In the 19th century, the area became known for tenement housing and later in 20th century these were mostly replaced with large scale social housing schemes.