San Sebastian Church in Quiapo is the only pre-fabricated steel church in Asia, and possibly in the world. Built in 1891 after two successive earthquakes destroyed its predecessors on the same site, the church was designed by Gustave Eiffel's associate Genaro Palacios, with the structural steel fabricated in Belgium and shipped to Manila for assembly.
The exterior is Gothic in style, complete with twin towers, pointed arches, and flying buttresses — all in painted steel. The interior continues the effect, with steel columns, steel vaulted ceiling, and steel altar installations. Everything except the floors and some internal fixtures is metal. The acoustic resonance is unique. The church remains an active parish in a busy commercial neighbourhood; visiting on a weekday morning gives the most peaceful experience.