July 8, 2020
by David Ryan
6 Comments
UPDATE – April 6, 2025
The dogs and revisited Hidden Mountain today and noticed that the vandalism is starting to fade away.

We also noticed that the State Land Office has installed No Trespassing signs. Trespass is not an issue if you have a State Land Office Recreation Access Permit. To purchase a permit, click on https://www.nmstatelands.org/ .

UPDATE – February 5, 2024
The dogs and I were at Hidden Mountain yesterday and discovered that the “World Famous” Mystery Stone has been vandalized with a coating of dark stain. The inscriptions are now difficult to see with your naked eye but can still be seen in a photograph. The State Land Office that manages the site is aware of the vandalism and is looking into how to fix the problem. In the meantime, you are still welcome to visit the Mystery Stone as long as you have a State Land Office Recreation Access Permit. Here’s a picture of the Mystery Stone that I took yesterday:

The original Blog Post begins below:
Hidden Mountain, the home of the world famous “mystery stone,” is a basalt covered uplift about 35 miles southwest of Albuquerque in the high desert grasslands west of Los Lunas, New Mexico. It is not very well hidden as it is readily visible from NM Highway 6 and is less than a mile from one of the busiest trans-continental rail lines (BNSF) in the country. Hiking at Hidden Mountain is featured in the 3rd edition of 60 Hikes within 60 Miles: Albuquerque (Hike 53). (More information on the 60 Hikes book is under the “60 Hikes” tab of this website.)

The world famous “mystery stone” is a nine-row inscription of ancient lettering carved into the face of a large basalt boulder near the base of the mountain. If you query Hidden Mountain, or Los Lunas Mystery Stone, or Decalogue Stone on the Internet you’ll find an amazing array of articles and YouTube videos with fantastic explanations on the meaning of the inscription.

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