I’m not sure if they’re still in use, and at one point two dykes coming out from the shores connected them to the shore, but the historic water intake towers at the Chain of Rocks are very cool. I took these photographs from the bridge.
The first one is a Palladian, Renaissance Revival design, and is much closer to the bridge and easier to see.
I love the detailing on the tower, which I imagine is very hard to reach nowadays.
Smaller, and harder to see, is the Romanesque Revival tower further downstream.