Adventurers explore a hidden tunnel nestled within Tilden Regional Park, merging architecture and the beauty of the outdoors. Full Description: On a crisp December morning, the allure of Tilden Regional Park in Orinda, California, beckons adventurers to a unique journey. The photo captures two individuals on a small train, one of them donning a hat, as they travel through a rustic tunnel. Surrounded by the park's lush foliage and rocky terrain, the scene beautifully intertwines human-made architecture with the serene wilderness. Sunlight filters through the trees, highlighting the peaceful coexistence of nature and urban elements.