Lisbon (1956 film)
"Lisbon" was entirely produced in the Portuguese capital city of Lisbon and its surrounding municipalities. It was considered the first Hollywood feature made in Portugal. For interior shots, the production used the facilities at Tobis Studios. Exterior shots included many locations in Lisbon, among them the Belém Tower, Praça do Comércio, the Castle of São Jorge and the Jerónimos Monastery. Outside the capital, there were seaside scenes filmed in Cascais and a scene at the belvedere of the Seteais Palace, in Sintra.
National redoubt
Since the early 19th century to the World War II, Lisbon was considered the national redoubt of Portugal. Besides being the capital, the largest city and the major port of the country, Lisbon was considered the last defensible redoubt in case of an invasion of Portugal by a major power. During this period, successive systems of defense were implemented.