The Ruins of St. Paul's, a historic landmark in Macau, stands as a testament to the region's rich cultural heritage. While many visitors flock to the site during the day, few are aware of the nocturnal guardians who watch over the ruins under the light of the moon. These security guards, tasked with protecting the site from potential threats, have developed an intimate knowledge of the stones, the shadows, and the silence that fills the night air. As the sun sets over the city, the guards take up their posts, their eyes scanning the darkness for any sign of disturbance. They know every nook and cranny of the ruins, every hidden corner and every spot where the moonlight casts an eerie glow. They have seen the site in all its moods, from the fierce storms that roll in from the sea to the calm, clear nights when the stars shine brightly overhead. The guards' knowledge of the ruins is not just limited to the physical layout of the site. They have also developed a deep understanding of the history and cultural significance of the ruins, which they share with visitors who wander into the site at night. They can tell stories of the Jesuit priests who once worshipped at the church, of the fires that ravaged the building, and of the countless generations of Macanese who have lived and died in the shadow of the ruins. Despite their importance, the night watchmen of the Ruins of St. Paul's remain largely unseen and unsung. They are the invisible guardians of the site, working tirelessly behind the scenes to ensure that the ruins remain safe and secure. And yet, their knowledge and experience constitute an oral history that is unparalleled, a unique and valuable perspective on the cultural heritage of Macau. In this blog post, we profile the security guards who watch over the Ruins of St. Paul's at night, exploring their role as nocturnal guardians of the site and their contribution to the preservation of Macau's cultural heritage. We delve into their stories, their experiences, and their knowledge of the ruins, shedding light on the unseen world of the night watchmen who keep the stones safe under the moonlight.