Ok here's a random one for the seasoned Angelenos!
Around where I live I've noticed two walking tunnels that go under Olympic. One is on Carillo (basically Crescent Heights) - it runs north to south under Olympic. The other is Olympic and Selby (again, north to south, under Olympic). You can see the entrances to them on Google Maps.
Does anyone know if there are others like this here on the West Side? I'm curious how these locations were chosen and not other intersections? It seems like a good idea - I wonder why there aren't more of them!