North Side is the area just across the Allegheny river from Downtown. In years past it was the independent city of Allegheny, but has long been incorporated into the City of Pittsburgh itself.
From downtown you may cross any of several bridges north, across the Allegheny river. The most direct is route 279, a large highway that will take you directly to the stadium areas and connects cleanly with the other large highways heading north. For mor local color you may take the Federal street bridge or the 7th or 9th street bridges. These bridges connect directly to streets in the northside whereas route 279 largely passes over them. Besides that these bridges are themselves notable as they are of a unique design: suspension bridges made of steel bars.
There is a lot to do in the North Side. Here are some highlights: