A 'seminary for foreign missions' had been set up on rue du Bac in 1637 by Monseigneur Duval, with an accord from pope Urban VIII, during the Counter Reformation. The seminary's oratory or chapel was built between 1683 and 1689, with interior decoration by Jacques Stella, Nicolas Poussin and Simon Vouet, and it was this chapel that operated secretly as a parish church for the area during the Revolutionary era when the area's actual parish church of Saint-Sulpice was shut down. In 1801 the chapel was attached to the church of Saint-Thomas-d’Aquin, which became the church for the Faubourg Saint-Germain, and the 'Missions étrangères' parish was officially recognised and split from the parish of Saint-Sulpice in 1802, at which time its curé was abbé Dessaubaz.
40 years later, in 1842, the parish was dedicated to St Francis Xavier. However, the chapel soon became too cramped for the seminarians and parishioners to share and the parishioners began construction on a new church in 1861 under abbé Jean-Louis Roquette (curé of the church from 1848 to 1889), headed by Adrien Lusson then Joseph Uchard and paid for by the Ville de Paris. The chosen site was in the corner of boulevard des Invalides and a planned boulevard right across the district towards rue des Saints-Pères that would meet the Seine level with pont du Carrousel. According to the principals of Haussmann's renovation of Paris, the new church would then form the end to this planned boulevard, explaining why its siting seems odd today, shifted over the boulevard and the hôtel des Invalides. Lusson began the works, but they were interrupted in 1863 and resumed under Uchard after Lusson's death. Work on the exterior was completed on 15 July 1874 and inaugurated at Easter 1875, at which point the interior decor was still incomplete. It was finally consecrated on 23 May 1894, the eve of Corpus Christi, in a ceremony presided over by François-Marie-Benjamin Richard, archbishop of Paris.
References:Towering 52 meters above the sea, Bengtskär lighthouse is the tallest one in Scandinavia. The building started in in 1905 after the shipwreck of S/S Helsingfors and was completed in 1906. The lighthouse was designed by architect Florentin Granholm. On December a special petrol lantern, designed and built in Paris, was brought to Bengtskär and installed atop the tower.
German fleet bombarded Bengstkär in the First World War in 1914. Since the Gulf of Finland was heavily mined, it was not until 1919 that the surrounding seas were declared safe for shipping, that the light was lit again.
After the war the military value of Bengtskär increased as part of the defence system of independent Finland. In Second World War (1941) Soviet Union made a suprise attack to island. After a bloody battle, the small Finnish garrison emerged victorious. Intermittent repairs to the facility continued during the post-war period.