Sadd el-Kafara

Often cited as the oldest major dam in the world, [this Ancient Egyptian masonry embankment](https://en.wikipedia.org/wiki/Sadd_el-Kafara) was begun around 2650-2700 BCE for flood control. It was never completed; in the absence of a proper spillway, it was apparently overtopped and destroyed by floodwater after roughly 10-12 years of construction. The stone-faced earth-and-rubble design makes it a landmark in the early history of large dam building, and the remains were rediscovered in 1885 by Georg Schweinfurth.

15th of May, Cairo, Egypt