![Modern Marvels](https://image.tmdb.org/t/p/w342/uRMi6q4mazNTZ2HKdiY6RP5noDW.jpg)
23 Tymor
705 Pennod
Modern Marvels - Season 1 Episode 1
The world’s largest concrete dam–and the largest concrete structure in the world–lies on the Columbia River in the State of Washington. B uilt in 1931, it is also one of the largest hydroelectric power plants in the world.
- Blwyddyn: 2022
- Gwlad: United States of America
- Genre: Documentary
- Stiwdio: History, H2
- Allweddair: technology, invention, disaster, construction, machine
- Cyfarwyddwr: Bruce Nash
- Cast: