🇳🇬 Nigeria · Megalith
Ikom monoliths
The Ikom monoliths are a series of volcanic-stone monoliths from the area of Ikom, Cross River State, Nigeria. The Ejagham may have engraved the monoliths around 200 CE.
🇺🇸 United States · Hydraulic works
Black Rock Dam (Schuylkill River)
The Black Rock Dam is a low head dam in the Schuylkill River. Originally constructed as a stone filled, timber crib dam in the early 19th century by the Schuylkill Navigation Company, the dam was one…
🇺🇸 United States · Hydraulic works
Illinois and Michigan Canal
The Illinois and Michigan Canal connected the Great Lakes to the Mississippi River. In Illinois, it ran 96 miles (154 km) from the Chicago River in Bridgeport, Chicago, to the Illinois River at…
🇬🇪 Georgia · Archaeological wonder
Katskhi Pillar
The Katskhi Pillar (Georgian: კაცხის სვეტი, kac'xis svet'i) is a natural limestone monolith located at the village of Katskhi in western Georgian region of Imereti, near the town of Chiatura.