7.41 avg 8 episodes 7.9 → 7.2 23 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Flying Machines | 7.9 | 15 |
| 2 | Founding Fathers | 8.2 | 13 |
| 3 | Pilgrims and Witches | 7.3 | 14 |
| 4 | Trick or Treat | 7.1 | 17 |
| 5 | The Inventors | 6.9 | 11 |
| 6 | Presidential Conspiracies | 7.7 | 13 |
| 7 | The New World | 7.0 | 13 |
| 8 | Roadside Stories | 7.2 | 12 |
7.32 avg 12 episodes 7.5 → 7.3 23 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Fool's Gold | 7.5 | 12 |
| 2 | Last Man Standing | 7.5 | 13 |
| 3 | Lost at Sea | 7.9 | 12 |
| 4 | Booze and Bullets | 7.6 | 12 |
| 5 | Patton and Grant | 6.8 | 12 |
| 6 | Red, White and True? | 7.4 | 11 |
| 7 | Wartime Rosies | 6.5 | 14 |
| 8 | Masters of Illusion | 7.3 | 12 |
| 9 | Seeing Isn't Believing | 7.5 | 9 |
| 10 | What Happens in Vegas... | 7.5 | 13 |
| 11 | Conquering the Sky | 7.1 | 12 |
| 12 | Engineering the Impossible | 7.3 | 11 |
7.48 avg 12 episodes 6.5 → 7.2 22 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Ike and MacArthur | 6.5 | 8 |
| 2 | Worlds of Amusement | 7.9 | 8 |
| 3 | Welcome to the Big Apple | 7.9 | 8 |
| 4 | The Princess and the Pathfinders | 8.1 | 10 |
| 5 | Kings of the Sky | 7.0 | 7 |
| 6 | Top Secret Vaults | 7.2 | 9 |
| 7 | Not So Close Encounters | 6.3 | 9 |
| 8 | Roads to Freedom | 8.1 | 8 |
| 9 | D.C. Decoded | 8.1 | 8 |
| 10 | Final Voyages | 8.2 | 9 |
| 11 | The Rock and the Bridge | 7.2 | 8 |
| 12 | Unwrapping the Holidays | 7.2 | 6 |
7.18 avg 8 episodes 6.8 → 7.2
| # | Title | Rating | Votes |
|---|---|---|---|
| 3 | Discovering America | 6.8 | 5 |
| 4 | The Great Escape | 7.0 | 5 |
| 5 | Tales of Sea and Sky | 7.4 | 6 |
| 6 | Engineering America | 6.8 | 6 |
| 7 | Saluting the Truth | 7.2 | 5 |
| 8 | Striking It Rich | 7.2 | 7 |
| 9 | Bonus Round: Defending the Truth | 7.8 | 8 |
| 10 | Bonus Round: All-American Landmarks | 7.2 | 6 |
6.69 avg 11 episodes 8.3 → 8.6 22 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | World War 2 | 8.3 | 8 |
| 2 | Smoking, Drinking and Gambling | 6.8 | 7 |
| 3 | Liberty, Leprechauns and Lounging | 6.5 | 6 |
| 4 | The Real West | 6.9 | 9 |
| 5 | Secret Societies | 5.4 | 7 |
| 6 | Space: The Final Frontier | 5.3 | 6 |
| 7 | The Atomic Age | 6.6 | 5 |
| 8 | American Villains | 6.4 | 5 |
| 9 | Famous Feuds | 6.0 | 6 |
| 10 | The Civil War | 6.8 | 7 |
| 12 | Moments That Changed History | 8.6 | 5 |
