The Carnegie Science Center is the best Science Center that my family has gone to. We were there from the time the doors opened at 9:00 am to just before it closed at 5:00 PM.
It is definitely geared for children. I would say children from the ages 5-17 would get the most out of it.
The OMNIMAX Theater is outstanding! It's a four-story, state-of-the-art IMAX Dome Theater, one of only 50 theaters of its kind in North America. It's the biggest screen, and the only dome screen, in the Pittsburgh region.
We also enjoyed exploring a real Cold War-era submarine, USS Requin outside the museum.
The kids just loved the Highmark SportsWorks building where the rock climbed, did lots of physical activities, and rode in a roller-coaster simulator.