I Spy with my little Eye

...something beginning with B. And ending with 'ridge'.

As you all know, bridges were invented as places to shelter boats under in case of rain or overly bright sunshine. Or to protect them from bird-poo. Or to provide nice echoes for echoey shouting. It was only after several thousand years that people stumbled upon their secondary functionality as crossing facilitators.

I liked this bridge because it was nice and echoey when I tried an experimental shout and because it looked a bit like an eye.