| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Los Angeles - Hollywood |
September 7, 2007
PBS
|
25 | |
| S04E02 | Santa Fe - Austin |
September 14, 2007
PBS
|
25 | |
| S04E03 | Austin - New Orleans |
September 21, 2007
PBS
|
25 | |
| S04E04 | Memphis - Washington, D.C. |
September 28, 2007
PBS
|
25 | |
| S04E05 | Philadelphia - New York City |
October 5, 2007
PBS
|
24 | |
| S04E06 | New York City |
October 12, 2007
PBS
|
24 | |
| S04E07 | San Francisco |
October 19, 2007
PBS
|
25 | |
| S04E08 | Bolinas - Seattle |
October 26, 2007
PBS
|
24 | |
| S04E09 | Seattle - Chicago |
November 2, 2007
PBS
|
25 | |
| S04E10 | Manchester - Boston |
November 9, 2007
PBS
|
25 | |
| S04E11 | Washington, D.C. - New York City |
November 16, 2007
PBS
|
25 | |
| S04E12 |
New York City
season finale
|
November 23, 2007
PBS
|
25 |
No artwork of this type.
No artwork of this type.
No artwork of this type.