Exploring the hidden paths of Tilden Regional Park. Full Description: On a sunny April afternoon, a group of adventurers navigates the mysterious tunnel in Tilden Regional Park, Orinda, California. Bundled in hats and jackets, they traverse the cool, shadowy passageway. The textured concrete walls echo the whispers of the city’s architectural history, inviting curiosity and discovery. As light gently pours in from the tunnel's mouth, the intrepid explorers move forward, embracing the blend of nature and urban intrigue. Captured on April 7, 2024, this moment reflects the allure of hidden treasures waiting to be uncovered.