Kallio Church

The Church of the Holy Trinity is an Orthodox church designed by Carl Ludvig Engel, consecrated in 1827. The church is Empire style and serves the large Russian-speaking minority of Orthodox in Helsinki, partly because the other Orthodox churches in the city have held their services in Finnish. The top of the church's bell tower was originally made of wood, but twenty years after its construction it was rebuilt in the present stone when new heavy bells were added to the church.

Helsinki Cathedral is a cathedral of the Evangelical Lutheran Church of Finland located in the centre of Helsinki. It was built between 1830 and 1852 when Finland was part of the Russian Empire (1809-1917) and was called St. Nicholas' Church. As early as 1818, Carl Ludwig Engel, who worked on the design of the whole square, drew the first plans of the church and refined them over a decade. The cathedral replaces the former Ulrika Eleonora church. The church did not officially become a cathedral until 1959 when the Helsinki Diocese was established.

Töölö Church is a brick church building in the Taka-Töölö district of Helsinki, designed by architect Hilding Ekelund and representing 1920s classicism.