Petersen Rock Garden, formerly Petersen's Rock Garden and also known as the Petersen Rock Gardens, is a rock garden and museum on 4 acres (1.6 ha), located between the cities of Bend and Redmond in Deschutes County, Oregon, United States. Rasmus Petersen, a Danish immigrant who settled in Central Oregon in the early 1900s, began constructing the garden in 1935 using rocks he found within an 85-mile (137 km) radius of his family home.
Petersen constructed detailed miniature castles, churches and other small buildings and monuments from a variety of rock types. He incorporated other design elements such as bridges, water features and natural landscaping. Petersen worked on the garden until his death in 1952; the garden has remained in his family's care since then. The garden, considered a roadside attraction with novelty architecture, includes roaming peafowl and a museum with a gift shop that sells rocks.
In 2011, Petersen Rock Garden was named one of Oregon's Most Endangered Places by the Historic Preservation League of Oregon (now known as Restore Oregon). In 2012, accidental damage to one of the stone bridges by a contractor catalyzed an effort to document the garden using laser scanning and other technologies. The garden was closed temporarily in 2013 to undergo repair and review for listing on the National Register of Historic Places. Petersen has been praised for his creative work, and the garden has received a positive reception for its uniqueness and local significance. Listing on the National Register was achieved on October 30, 2013.
Petersen Rock Garden, considered a roadside attraction with "eclectic" novelty architecture, is located 3 miles (4.8 km) off U.S. Route 97, 10 miles (16 km) north of Bend and 7 miles (11 km) south of Redmond. It contains dozens of "fanciful" and "intricately detailed" miniature buildings, including castles, churches and cottages, constructed from agate, jasper, lava, malachite, obsidian, petrified wood and thundereggs. The 4-acre (1.6 ha) grounds also contain roaming peafowl and a small museum with a gift shop that sells rocks, including crystals, fossils and semiprecious gemstones. The museum features a fluorescent room with miniature castles constructed from manganese, tungsten, uranium and zinc that glow in the dark. Petersen Rock Garden is open every day from 9 a.m. until closing time, which varies depending on the season. As of 2009, admission is $4.50 for adults, at self-pay stations. It is not a member of the Oregon Museums Association.