ELI5: Explain Like I'm 5

Barton Swing Aqueduct

Barton Swing Aqueduct is a bridge that carries water over a river. It sits on two 'arms', which are like two long shelves connected together in the middle. The water flows onto one arm, which carries it over the river, before it flows onto the other arm and continues down the river. It looks a bit like a see-saw.