I have been to the incline many times, yet it still fascinates me. called the Mon Incline by locals -- is the oldest and steepest incline in the United States, as well as the nation's oldest cable car operation. The view from the upper incline station is amazing, and just looking down upon the city from there is breathtaking. If possible, spend some time in the incline station; there are lots of neat historical photographs.
* This is a must-do while in Pittsburgh.