No power whatsoever

[EdWindows]

So yesterday while running errands, my car decided to drop dead.
Basically, I turned the key to start the car and everything turned off as if a breaker had flipped. No interior lights come on when I open the door, and my clicked doesn't work. It's as if the battery is disconnected.

I checked just about everything and everything seems ok on the surface.
-Fusible link is intact.
-All fuses are intact.
-Battery is fully charged.
-Battery connectors are clean with no corrosion.
-All ground cables and other power carrying cables have full continuity.
-Switched around all my relays in the main fuse box and nothing.

There's no voltage to any fuses when I put the key in the On position either.
I haven't checked the ignition switch yet, and I am going to go through all the power wiring in and around the battery and fuse box.

Anyone have any ideas what could be wrong?