The Church of the Holy Trinity is at the shrine of Fatima, where the Virgin Mary is said to have appeared to three shepherd children in 1917.
The low, oval, white building - which cost 60m euros (£42m) to build - can accommodate nearly 9,000 worshippers and has no internal columns.
Designed by Greek architect Alexandros Tombazis, it has 13 doors, said to represent Christ's last supper with the 12 apostles.
The site, 113km (70 miles) north of the Portuguese capital Lisbon, took three years to build and is said to be the world's fourth biggest church.
eu fui ver o mar... - novembro 2012, Leça da Palmeira
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