Season 23 aired between 11 Oct 2010 and 11 Apr 2011, 12 episodes.
Episodes
E01
God in America (1) A New Adam
11 Oct 2010
E02
God in America (2) A New Eden
11 Oct 2010
E03
God in America (3) A Nation Reborn
12 Oct 2010
E04
God in America (4) A New Light
12 Oct 2010
E05
God in America (5) Soul of a Nation
13 Oct 2010
E06
God in America (6) Of God and Caesar
13 Oct 2010
E07
Robert E. Lee
03 Jan 2011
E08
Dinosaur Wars
17 Jan 2011
E09
Panama Canal
24 Jan 2011
E10
The Greely Expedition
31 Jan 2011
E11
Triangle Fire
28 Feb 2011
E12
The Great Famine
11 Apr 2011