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Hidden Gem: Petaluma Adobe State Historic Park features a "Ghost Garden." Built in the 1830s, this garden was rediscovered in the 1950s and now showcases authentic species of plants that were commonly found in early California, offering a glimpse into the area's rich history. 2. Quirky Detail: Did you know that Petaluma Adobe is made entirely of adobe bricks? Its walls are about two feet thick and made from a mixture of clay, straw, and water. This traditional construction method helps to keep the building cool in the warmer months and warm during the colder ones. 3. Local Legend: Legend has it that a secret room exists within Petaluma Adobe. Although it has never been found, some believe it was used by General Mariano Vallejo, the original owner of the adobe, to hide important documents during times of political unrest. 4. Historically Significant: Petaluma Adobe is recognized as the largest privately owned adobe structure in Northern California. It played a crucial role in the early days of California's history, as General Vallejo was instrumental in securing Mexican independence and participating in the Bear Flag Revolt. 5. Fascinating Fact: The park offers hands-on activities for kids, like adobe brick making and dipping candles. You can step back in time and experience what life was like in early California, learning traditional skills and crafts that were integral to daily living in the region.