TUGUEGARAO CITY—In the heart of this city, the Cagayan Museum and Historical Research Center quietly gathers Cagayan Valley’s memories—from half-a-million-year-old fossils to relics of Spanish forts—offering visitors a vivid journey through the histories that molded the region’s identity. “The northern Luzon region today had literally been part of the old Cagayan—San Fernando, now Ilagan City;
