It was Jack's home before he was decapitated, and remained untouched by outsiders afterwords, with the rest of the town being built around it, and no attempts to remove it.
It sits on top of a cliff with a winding pathway leading up to it. It is shown to have a large round window, a tall tower, and as far as one can tell, no modern conveniences. It has vines crawling up it in some areas, and in some shots has a dead tree next to it.
It is located in Downtown Endsville, and is surrounded by modern skyscrapers.