[gallery] Bostons South End neighborhood is located north of the Roxbury neighborhood and west of the Back Bay. In 1801 architect Charles Bulfinch designed a new residential area that would be created by filling in the marshes and tidal flats along Boston Neck which was a narrow strip of land that connected Boston to what was then the town of Roxbury. Although Bulfinchs plan was not implemented, in 1849 his plans were refined and the city fill project began. The streets of the South End were designed in the style of 18th century English style consisting of blocks of townhouses overlooking small parks. Good examples of this design can be seen in the exclusive area of Union Park and in Worcester Park. Between 1850 and 1880 entire blocks of houses were built by speculative builders, many in a townhouse style, and some in the new French flat style in which all the rooms of the apartment were on the same floor. Known for its many jazz clubs in the 1950s, today the South End is one of Bostons most diverse neighborhoods, and is also known to have one of Bostons most popular and eclectic restaurant districts. Some key points of interest in the South End include The Cathedral of the Holy Cross, which was the largest Catholic church in the nation at the time of its dedication in 1875, and Restaurant Row, the heart of which lies on Tremont Street. Some of the luxury developments in the South End include The Modern, The Savoy Lofts, Atelier 505 and The Wilkes Passage Lofts.