hmm yes, Progress of Civilization is the sculpture.
"The sculptural pediment over the Senate entrance on the U.S. Capitol's east front is called Progress of Civilization."
anyway, I already knew there were several different answers that can be given, so it seems you got the title wrong and patrick got it right.
But I still accepted you entry due to the link you provided. I just accepted whatever was in the link as correct answer.
the website you gave http://www.parisdeuxieme.com/2010/01/library-of-congress-main-reading-room.html
has this :-
"The round mural set inside the lantern of the dome depicts Human Understanding
, looking upward beyond the finite intellectual achievements represented by the twelve figures in the collar of the dome."
so if the rules included no links, then still patrick would have had the correct answer (for the name of the mural)
that's the end of Islamic Quiz - 2 , until next time