Standing 535 ft, the 42-story Late Gothic Revival Cathedral of Learning is the tallest educational building in the Western hemisphere and the centerpiece of the Univ of Pittsburgh campus; it is also the 2nd-tallest gothic-styled building in the world
I've visited the 9/11 Memorial a couple of times so skipped it on this trip; One World Trade Center (ie Freedom Tower) is still jaw-dropping as the tallest building in the Western Hemisphere (the same architect designed Willis Tower and Burj Khalifa)