Kebar Dam

[Kebar Dam](https://en.wikipedia.org/wiki/Kebar_Dam) is an exceptionally early masonry arch dam, generally dated to around 1300. Its small reservoir is no longer used and is mostly filled with silt, making it a rare example of a very old dam that still stands but has effectively lost its original function. - **Unusual technique:** early arch-dam design in masonry, [often cited](https://www.iranicaonline.org/articles/band-dam/) as one of the oldest surviving examples of that structural idea. - **Why it remains:** chiefly for historical and engineering significance.

Kahak, Qom, Iran