Located just north of Beacon Hill and west of the North End is Bostons West end. Initially settled in the late 18th and early 19th century after the neighboring North End and Beacon Hill began to get crowded, the West End eventually became home to many immigrants. Today the West End is best known for the controversial urban renewal plan that was implemented in the 1950s which resulted in over half of the neighborhood being completely leveled and rebuilt with residential high rises, shopping centers and parking lots. The central square at the time, Scollay Square, was leveled and became Government Center, home of Bostons architecturally controversial City Hall. There were some buildings that escaped the demolition including Massachusetts General Hospital, the Charles Street Jail which has since been repurposed into the Liberty Hotel, and the Bulfinch Triangle which is the section of older buildings located roughly by Canal, Market, Merrimac, and Causeway Streets. This neighborhood is also home to North Station, the train station that serves the suburbs north of Boston, and the TD Garden, home of the Boston Bruins and Boston Celtics. Over the last 20 years this area has again changed dramatically with the removal of the elevated trolley lines which ran over Causeway Street, as well as the completion of the The Central Artery/Tunnel Project (The Big Dig) in which Interstate 93 was rerouted underground and then over the Zakim Bridge.