The Prologue and the Promise Mural by Robert McCall

For some scale, this mural is a staggering 19 feet by 60 feet! It is huge!
Robert McCall spent 3 months on this project planning and developing the artwork, and spent another 6 months on the actual process of painting the mural that was featured near the exit of the "Future Worlds" exhibit in Disney's Epcot Center, the exhibit which sadly closed in 1999.
Some interesting notes from the webpage:
According to the artist, Bob McCall, the mural represents the "flow of civilized man from the past into the present and toward the future."
Additionally, McCall painted himself and his family into the Horizons mural. On the hill holding hands are their daughter Linda along with her husband, children, and dog. Just in front of them are McCall and his wife, Louise. Below the Washington Monument lifting her child in the air is their daughter Cathy and her husband.