Step back in time and discover a significant piece of Vietnamese religious and linguistic history at Mang Lang Church, located inland near the O Loan Lagoon, north of Tuy Hoa. Built in 1892, this beautiful church is one of the oldest Catholic churches in Vietnam, showcasing striking Gothic architecture with its pointed arches and stained-glass windows – a style somewhat unexpected in this rural setting. Its historical importance and unique architecture make it a fascinating hidden gem destination in Phu Yen.  

Beyond its architectural beauty, Mang Lang Church holds immense cultural significance as it houses one of the earliest books printed in Vietnam's romanized Quoc Ngu script. This book, the "Sermons for the Whole Year" by Alexandre de Rhodes (printed in 1651), represents a pivotal moment in the development of the modern Vietnamese written language. Visitors can often view this precious artifact displayed within the church's small museum or exhibition area, connecting the site to a crucial part of Vietnam's literary history.

Visiting Mang Lang Church offers a peaceful and culturally enriching experience. Admire the Gothic design, explore the church grounds, and learn about its historical importance from local caretakers or information displays. Often combined with trips to Ganh Da Dia and O Loan Lagoon, this hidden gem provides a unique glimpse into the history of Catholicism in Vietnam and the evolution of its written language, adding a different dimension to a Phu Yen tour beyond the coastal scenery.