Super Mystery!  LbNA # 21588

OwnerDem XX Men    
Placed DateApr 21 2006
Location???, CA
Found By ???
Last Found Jul 11 2008
Hike Distance?

April 19, 1901

Dear Diary,

Reflecting upon last night's seance, I wandered my well manicured grounds. I considered placing 13 Tiffany windows in the aviary, but decided the birds would not appreciate the priceless view. At 3 o'clock I stopped at my favorite fountain, the egret, and spied on the workers installing the stag statue. I then took 13 paces and paused, my hand on the doorknob. A ghostly chill ran down my spine and took my breath away. I had to sit for a moment to regain my composure. My right hand fluttered to my brow. I had a premonition that if I left a small offering hidden here, the spirits may lessen their wrath.

Beware of hardhat-wearing phantoms. They do not walk through walls but do open door inconveniently.

Note: no admission required to find letterbox
Need another hint? It's California Registered Historical Landmark # 868 (It'd be better if it was #13, but oh well).

Found by:
Aahz and Zairabear April 2006