| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | adit | ancient Roman engineering | Adits were used as drainage tunnels in ancient Roman mines and quarries. | 1 |
| 2 | arches | ancient Roman engineering | Ancient Roman engineering pioneered the use of arches in architecture and engineering. | 1 |
| 3 | colosseum | ancient Roman engineering | The colosseum symbolizes advanced engineering and architecture in ancient Rome. | 1 |
| 4 | roads | ancient Roman engineering | Ancient Romans built a durable road system for military and civil use. | 1 |