Brace yourself for macabre tales of philadelphias past on this spellbinding walking tour see sights including the christ church burial ground the betsy ross house and elfreths alley as your three historian guides tell you about philadelphias dark side hear fascinating and frightening anecdotes about grave robbers such as dutch pillet and levi chew serial killers including the corpse collector and frankfort slasher and the yellow fever epidemic that ravaged the city in 1793 afterward