| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| This massive project was the first in North America to contain more masonry than the Great Pyramid at Giza | the Hoover Dam DD | $2,600 | J | 1930s ENGINEERING FEATS | 2013-12-16 | #6731 | |
| Tajikistan has the highest one of these in the world; the U.S. doesn't even make the Top 10 with Hoover | Dam | $100 | J | ENGINEERING | 1998-10-29 | #3254 | |
| 274 million cubic yds. of earth & rock went into the new Cornelia Tailings in Ariz., biggest earthen one ever | dam | $200 | J | ENGINEERING | 1988-12-13 | #987 |