An Oregon farmer began stacking rocks at age 52 as a winter hobby; over 17 years, his bridges, castles and miniature landmarks grew into Petersen Rock Garden

Somewhere between Bend and Redmond, Oregon, a four-acre plot of land preserves the legacy of a Dane whose rock garden became a historic site. There was neither a meditative retreat from the daily grind nor a post-college pottery class. Just a farmer, the rocks he cleared from his own yard, and seventeen resilient winters.

It's an anachronism to even discuss in 2026. The word hobby itself has been co-opted, weaponized, rebranded as self-care. But according to a 2023 Nature Medicine study titled “Hobby engagement and mental wellbeing among people aged 65 years and older in 16 countries,” led by UCL researcher Dr. Karen Mak, which followed more than 93,000 participants aged 65 and above from 16 different countries, those who reported having a hobby showed significantly fewer symptoms of depression and higher life satisfaction on average compared to those who did not, across nearly all income levels and regions. Rasmus Petersen clearly never read the daily paper, but he may have been one of the first American case studies for the science of it.

The man behind the mosaic


Petersen arrived in central Oregon in the early 1900s and claimed 80 acres of land in Redmond under the federal Desert Land Act in 1906. He was an unremarkable farmer for nearly three decades, raising hay and grains, livestock, then potatoes when the Depression made any other crop unviable. It wasn't until he was 52 years old that Rasmus decided to turn the agate, jasper, and obsidian volcanic stones his own plows unearthed into miniature castles, churches, and bridges, sourcing them all within roughly 85 miles of his home. What began as a distraction from the long winters turned into a fully-fledged folk-art movement by the 1938 season. More than 7,000 inquisitive strangers showed up just to see it in person. The 120,000 annual visitors would come shortly thereafter in the early 1950s.

There is only one plaque on the entire property, tucked underneath a miniature Statue of Liberty. "Enjoy yourself. It is later than you think." Petersen died in 1952, having spent seventeen years building something that could never be farmed, sold, or converted into the kind of income he’d spent the rest of his life chasing. It was an odd thing to leave behind: a monument meant to outlive him, built just as the monetization of hobbies was beginning its takeover of American culture.

The genre nobody knows how to protect

Here's the problem: the place fell into such disrepair by 2011 that the Historic Preservation League of Oregon added it to the list of the state's "Most Endangered Places." It took a two-year documentation effort before the National Park Service added the Petersen Rock Garden to the National Register of Historic Places in October of 2013, recognizing it as a "folk art environment" of sorts. There is a niche category for these sorts of independently-created large installations, but it doesn't carry the same institutional heft that a museum-endorsed experience would.

The category has its own dedicated watchdog in the Saving and Preserving Arts and Cultural Environments (SPACES), an archive now housed at the John Michael Kohler Arts Center in Sheboygan, Wisconsin. Its site database catalogs historically significant information on more than 1,400 sites in the United States alone, plus numerous others overseas. Petersen’s garden survived due to an unusually strong family commitment. His wife, then his stepdaughter, then his granddaughter all took care of the grounds for seventy years before a nonprofit could take over in the 2010s. This may be an increasingly American phenomenon: create something remarkable in midlife, then leave it to whoever is willing to take on the responsibility after you're gone.

What a dead farmer can teach a burned-out modern generation

Petersen's garden is none too fancy or elegant. It leans more towards the lopsided, the homemade, the strange (lighthouse next to a miniature Liberty Bell next to a rock church). But this is precisely the appeal of the place. It is a monument to slow, steady, purposeless creation in an era that demands constant productivity and brand-building. It may be worth the detour the next time you're driving through central Oregon. Just don't expect it to impress right away. It took seventeen winters to look like something you'd recognize as a garden.