correosfilipinas:

Basilica of San Sebastian, Manila c 1800

Completed in 1891, San Sebastian Church is noted for its architectural features. An example of the revival of Gothic architecture in the Philippines, it is the only all-steel church or basilica in Asia. It has also been implausibly reputed to be the first prefabricated building in the world, and more plausibly claimed as the only prefabricated steel church in the world.

The prefabricated steel sections that would compose San Sebastian Church were manufactured in Binche, Belgium. According to the historian Ambeth Ocampo, the knockdown steel parts were ordered from the Societe Anonyme des Enterprises de Travaux Publiques in Brussels. In all, 52 tons of prefabricated steel sections were transported in eight separate shipments from Belgium to the Philippines, the first shipment arriving in 1888. Belgian engineers supervised the assembly of the church, the first column of which was erected on September 11, 1890. The walls were filled with mixed sand, gravel and cement. The stained glass windows were imported from the Henri Oidtmann Company, a German stained glass firm, while local artisans assisted in applying the finishing touches of the steel church.