Notice how nice and flat the streets look surrounding the Courthouse and Jail behind it. After the streets were dug away, new stone was put on the exposed bottoms of the Courthouse and Jail.
Why does the new stone look so much whiter than the old stone?

Because the new stone is a different kind of stone than the old stone

Because the new stone had not been around long enough to soak up the soot from Pittsburgh’s dirty air

Because workmen scrubbed the new stone so it would be clean
Correct!
Wrong, try again!

Historic photo showing new stone added
Last Fact New Fact