Super Mystery!  LbNA # 21588

Placed DateApr 21 2006
Location???, CA
Planted ByDem XX Men    
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