yo, its the friendly iowan raccoon dude! i recently went exploring in a local park and found a path that leads under one of my main bridges and let me tell you that was wild. the shift from forest and woods to the mere sound of cars driving over the bridge and just my sister and i's voices bouncing off the concrete underbelly of it was another dimension. climbing up to small spaces just big enough to comfortably sit under with nothing but the sound of tires was something ill be going back to.
Oooh, that’s neat! I love the weird almost-underwater feel of being alone under bridges or piers while people or cars move over you. I used to hide out under a restaurant balcony when I was a kid, where I could hear all the people above me talking and wandering around in a weirdly muffled way, and all the geese from the pond the balcony was overlooking would cluster around me (I was a weird kid but it felt safe and happy and private to me).