This is the Parliament of Canada and it is acctualy one building the front part is the peace tower as you move your way to the left you have the houses of parliament and the senate and that last building is the library of parliament. The reason it looks almost detached is because on Feb 3 1916 the original parliament burnt down but the managed to save the library and as a result of construction it is kind of a different building. The library was completed in 1876 while the new parliament was completed in 1922 and the peace tower finally in 1927.
Hope that sheds some light and if your in Ottawa give me a holler I work there
oh and it is a side view as well here is a front view from a web cam on a building across the streethttp://www.parliamenthill.gc.ca/text/camera-eng.html