The Winchester Mystery House was commissioned by widow Sarah Winchester, after a medium told her that if she did not continue building a house forever, she would die. The result is a strange 7 story mansion (reduced to four stories after the 1906 earthquake) with dead ends, traps, false fireplaces, and more:
She believed her only chance of a normal life was to build a house, and keep building it. If the house was never finished, no ghost could settle into it. The house contains many features that were utilized to trap or confuse spirits. There are doors that are small or lead nowhere and windows that look into other parts of the house. The mansion may be huge but there are only two mirrors in the whole place. This is because Sarah believed that ghosts were afraid of their own reflection.
The house has about 160 rooms, including 40 bedrooms, 2 ballrooms, 47 fireplaces, 10,000 window panes, 17 chimneys, 2 basements and 3 elevators.