The Mystery Spot was listed in the California Register as a California Historical Landmark, countersigned by the Director of California State Parks on August 22, 2014. The Mystery Spot is California Historical Landmark number 1055.
The official press release by the CALIFORNIA DEPARTMENT OF PARKS AND RECREATION issued on July 30, 2014 reads:
“This roadside attraction established in 1941 is the first and most significant example of its type in California, a "tilt-box" or "gravity house" roadside attraction that gained popularity in the mid-twentieth century. Established by George Prather, the Mystery Spot became a popular roadside attraction under the stewardship of Prather's son Bruce in the late 1940s and 1950s.”
Read the official press release.