Ilocos Sur sits on the northwestern Luzon coast, sandwiched between the Cordillera foothills and the South China Sea. It contains one of the most significant historical sites in Southeast Asia: Vigan City, a Spanish colonial town whose cobblestone streets and baroque architecture survive with a completeness found nowhere else in the region.
Vigan is the jewel and the burden of Ilocos Sur — a UNESCO World Heritage Site that defines the province's international identity while also generating the preservation pressures and tourism management challenges that come with that designation. The provincial capital is the oldest city in the Philippines established by a European colonial power.
Vigan was inscribed as a UNESCO World Heritage Site in 1999. It is described as the best-preserved example of a planned Spanish colonial town in Asia. Its historic core — the Mestizo District or Calle Crisologo — contains over 200 houses from the eighteenth and nineteenth centuries, still occupied and maintained by their owners.
Outside Vigan, Ilocos Sur is an agricultural province of weaving towns, tobacco fields, and colonial churches. The province produced several major figures in Philippine history, including Padre Jose Burgos, one of the three martyred priests of 1872 whose execution helped catalyze the Philippine nationalist movement.