By contrast with its neighbours, Green Park has no lakes, no buildings and few monuments, having only the Canada Memorial by Pierre Granche, the Constance Fund Fountain and the RAF Bomber Command Memorial, opened in 2012. The park consists entirely of mature trees rising out of turf: parkland; the only flowers are naturalized narcissus. The park is bounded on the south by Constitution Hill, on the east by the pedestrian Queen's Walk, and on the north by Piccadilly. It meets St. James's Park at Queen's Gardens with the Victoria Memorial at its centre, opposite the entrance to Buckingham Palace. To the south is the ceremonial avenue of The Mall, and the buildings of St James's Palace and Clarence House overlook the park to the east. Green Park tube station is a major interchange located on Piccadilly, Victoria and Jubilee lines near the north end of Queen's Walk.