From the link you posted, I like this one:
In early historic times in Siberia, a condemned prisoner would be tied naked to a tree and left to slowly die through starvation and blood loss from mosquitoes, horseflies and other insects.
I liked this one......
The book Papillon describes how a particularly brutal guard was captured, tied down over a nest of fire ants and left to be eaten alive.
I’ve dealt with fire ants. They are brutal. But I think death would be a little too fast.
I'm for that, and his vocal cords should be ripped out so no one has to hear the bastard whine.