The Blood-eagle
Basically, person would be tied, then his back would be cut open, skin removed, exposing the ribs, then each rib would be broken in form of the wings, and some left it there, but Vikings went a step further. They would take out victim’s lungs and hang them on the broken ribs.
Victim would be alive through most of the punishment, dying when their lungs were removed.
That would be so painful to the victim, that arguably it’s the most painful punishment in the history of the human race.
Credit : Quora
Picture Credit : Google