The Altadena Hiker called this waterway "the catacombs." Your dictionary will tell you a catacomb is a subterranean burial chamber.
So where are the dead bodies? Perhaps the Hiker knows. I'm not going to argue with her. Instead, I tried to make it look scary by messing with the picture. But in truth, it's just more beauty. Even the drainage ditches are pretty. That's Altadena for you.
And that's all for Altadena, at least for now.