I found this quite interesting: 

History was made with the premiere of the special, “ Life After People,” on Monday, January 21st. It was the most watched and highest rated telecast of all time for The History Channel:  #1 Show for the night on cable; #1 Original Telecast in Total Viewers Ever; #1 Series or Special Premiere Ever; #1 in Household Ratings Ever -History.com also posted best-ever numbers making “Life After People” the highest trafficked day of all time for a programming event.