The old church of Helsinki was designed by famous architect C. L. Engel and completed in 1826. It was originally mentioned to be temporary church for the construction time of new cathedral in Senate Square.
When the old Ulrika Eleonora Church was demolished, the recovered building materials and part of the movables were auctioned but some of the furnishings including the pulpit, benches and chandeliers as well as the organ were relocated to the newly built church. These furnishings were however replaced over the years with the exception of the pulpit. A new 36 stop organ built by Per Larsson Åkermann was installed in 1869.
The altarpiece painted by Robert Wilhelm Ekman was initially commissioned for Helsinki Cathedral, but was instead placed in the Old Church in 1854.
The old park, called also as “the Plague Park” , surrounding the church was originally a cemetery. It’s name cames from the time of Great Wrath (1710), when many victims of plague were buried to the ground. The latest burial was made in 1919. At the northeast corner of park lies the tomb of merchant Johan Sederholm (1722-1805).
At weekends the church is popular place for weddings and other events.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.