| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| Containing 167 arches, one of these built in 50 A.D. is still delivering water from the Frio River to Segovia, Spain | an aqueduct | $800 | DJ | ENGINEERING | 2015-04-16 | #7049 | |
| Used extensively by the Romans, it's a bridge built to transport water, not people | an aqueduct | $400 | J | TERMS OF ENGINEERMENT | 2007-05-21 | #5236 |