In 1884, a wealthy widow named Sarah L. Winchester began a construction project of such magnitude that it was to occupy the lives of carpenters and craftsmen until her death thirty-eight years later. The Victorian mansion, designed and built by the Winchester Rifle heiress, is filled with so many unexplained oddities, that it has come to be known as the Winchester Mystery House (more on Wikipedia). Can you spot the drop door ? See it from the reverse side. (via)