Question: In 1854, Pope Pius IX donated a marble block for the construction of what U.S. building?
A) Union Station
B) The Pentagon
C) The White House
D) National Cathedral
E) The Washington Monument
F) The U.S. Supreme Court
Answer: E) The Washington Monument
Was this block ever installed?
https://boundarystones.weta.org/2013/07/16/mystery-popes-stone