The inclines are highly recommended. Buy a day pass, take the bus to the Duquesne, ride up, enjoy the view, walk to the Monongahela, ride down, and take the light rail back downtown. When visiting the Duquesne Incline, don't forget about the machine room. As of little over a year ago, one can observe it and the cables from a balcony. Look for the turnstile, which costs 50 cents to enter. It's nestled in the corner and not incredibly overt.