Temppeliaukio is a Lutheran church in the Töölö district of Helsinki that was not built on rock but excavated out of it. It is known as the Church of the Rock, and the walls are the bedrock itself.
Getting it made took four decades and a war. Plans began in the 1930s, a plot was chosen and a design competition held. J. S. Siren won a second competition, and his scheme was cut short in its early stages when the Second World War began in 1939. After the war another competition was held, and the brothers Timo and Tuomo Suomalainen won it in 1961. On economic grounds their plan was scaled back until the interior was about a quarter of the original design. Construction finally started in February 1968 and the rock church was consecrated in September 1969.
The interior is cut directly from solid rock and lit from above: a skylight rings the copper dome at the centre, so daylight falls down the rock walls rather than through windows in them.
Those walls are also the reason musicians want the building. The acoustics come from the rough, virtually unworked rock surfaces, which scatter sound instead of returning it flat, and the church is in constant use as a concert venue. That the raw rock is now its defining feature is a slight accident of history, since the exposed walls were not part of the original competition entry.
It is a working parish church in the middle of a capital city, so services take priority over sightseeing and opening hours vary.
Finland
See it on the map
Other places on the map within a couple of hours.
