Grand Canyon by s_hoot Star this if you like it!
More photos from USA
Church of the Covenant, an 1867 Gothic Revival masterpiece, has one of the largest collections of liturgical windows by Louis Comfort Tiffany in the country; its 236 foot steeple is the tallest in Boston
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)
St. Paul's Cathedral, built in Gothic Revival style and completed in 1905, was inspired by the Cologne Cathedral; Pittsburgh has roughly 300,000 residents while the metro area has 2.3+ million
