In the US, the "parking lights" on every car I've ever driven lights up all the same bulbs as turning the headlight on, minus the headlights themselves. This includes the taillights, all the marker lights, license plate lights, and even the nighttime illumination for the gauges and controls inside the car. I haven't tried it, but I doubt your average car battery would power all of that more than a few hours and be able to still start the car.
I'm not even sure what the purpose they are supposed to serve on our vehicles. In many jurisdictions it's actually illegal to drive with your parking lights on (even during the day), though I would guess your chances of actually being ticketed for it are pretty low.