Pennsylvania was called a holy experiment because a bunch of Quakers decided to experiment (it was holy because it was just Quakers) and try to make a community in what is now Pennsylvania.
His holy experiment was to have religioustoleration (letting people practice whatever religion they want) throughout his colony.
Penn's woods or currently Pennsylvania is associated with the Holy Experiment of the Quakers in the mid 17th century.
Pennsylvania
Germany
Pennsylvania.
Pennsylvania
William Penn
I do not know of any "Holly experiment", however:The "Holy Experiment" was an attempt by the Religious Society of Friends (Quakers) to establish a community for themselves in Pennsylvania.
holy experiment
Edens Lost and Found - 2006 Philadelphia The Holy Experiment 1-2 was released on: USA: 25 May 2006
a wise man from the eastWilliam penn