When Serion inherits his grandmother's leather-bound journal, he and his cousin Nalorin embark on a globe-trotting pilgrimage through 25 UNESCO Heritage Sites. From tracing Angkor Wat's celestial dancers to listening for echoes in Rome's Colosseum, they dive into local traditions—weaving textiles in Oaxaca, baking bread in Petra, and chanting in China's Mogao Caves. Each chapter brings new sketches, stamps in their homemade "Heritage Passport," and lessons from artisans, monks, and guardians of living history. Their final stop? A bustling home-town festival where classmates taste world flavors, don handcrafted costumes, and share the stories that connect our past to tomorrow.