7.66 avg 10 episodes 7.7 → 8.0 42 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Tokyo's Sky City | 7.7 | 26 |
| 2 | Subways in America | 7.5 | 23 |
| 3 | Transatlantic Tunnel | 7.4 | 28 |
| 4 | City in a Pyramid | 7.2 | 25 |
| 5 | Bridging the Bering Strait | 7.2 | 26 |
| 6 | Tunneling Under the Alps | 7.5 | 27 |
| 7 | Building Hong Kong's Airport | 8.6 | 36 |
| 8 | Holland's Barriers to the Sea | 7.8 | 31 |
| 9 | Boston's Big Dig | 7.7 | 25 |
| 10 | Widening the Panama Canal | 8.0 | 26 |
6.97 avg 3 episodes 7.8 → 6.6 53 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 3 | Oakland Bay Bridge | 7.8 | 16 |
| 5 | Cooper River Bridge | 6.5 | 18 |
| 8 | Excavators | 6.6 | 17 |
7.55 avg 6 episodes 7.6 → 7.8 43 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Super Stadium | 7.6 | 17 |
| 2 | Mega Tunnel | 7.5 | 10 |
| 3 | Biggest Warship | 8.1 | 19 |
| 4 | Sakhalin Oil & Ice | 6.8 | 14 |
| 5 | Big Easy Rebuild | 7.5 | 15 |
| 6 | Space Tower | 7.8 | 13 |
8.05 avg 6 episodes 8.2 → 8.1 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | NYC: South Ferry Subway Station | 8.2 | 8 |
| 2 | World's Biggest Arch Bridge | 8.6 | 7 |
| 3 | JFK: JetBlue Terminal | 8.7 | 8 |
| 4 | Stonecutters Bridge: Hong Kong | 6.7 | 9 |
| 5 | California Academy of Sciences | 8.0 | 7 |
| 6 | Hallandsas Ridge Tunnel: Sweden | 8.1 | 9 |
7.79 avg 7 episodes 8.4 → 7.0 22 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Building a Destroyer | 8.4 | 8 |
| 2 | Fault Zone Tunnel | 7.8 | 10 |
| 3 | Boot Camp | 8.0 | 8 |
| 4 | World's Tallest Skyscraper | 7.3 | 12 |
| 5 | Battle Machines | 8.2 | 9 |
| 6 | Coaster Build Off | 7.8 | 8 |
| 7 | Hurricane-Proof Homes | 7.0 | 8 |
