The spooky landmark will once again have its rare evening flashlight tours this weekend, and again on Halloween night.
If you miss those opportunities, you will have to wait until the next Friday the 13th.
For those of you who don't know, the Winchester Mystery House is a mansion with a bewildering maze of rooms and stairways.
As you can imagine, It's even more scary and mysterious at night.
A woman named Sarah Winchester owned it, and thought she would never die as long as construction continued on her mansion.
Today it is a California State Landmark, listed on the National Register of Historic Places.