Hallgrímskirkja is a Lutheran (Church of Iceland) parish church in Reykjavík, Iceland. At 74.5 metres high, it is the largest church in Iceland and among the tallest structures in the country. The church is named after the Icelandic poet and clergyman Hallgrímur Pétursson (1614–1674), author of the Passion Hymns.
Situated on a hilltop near the centre of Reykjavík, the church is one of the city's best-known landmarks and is visible throughout the city. State Architect Guðjón Samúelsson's design of the church was commissioned in 1937. He is said to have designed it to resemble the trap rocks, mountains and glaciers of Iceland's landscape. The design is similar in style to the expressionist architecture of Grundtvig's Church of Copenhagen, Denmark, completed in 1940.
It took 41 years to build the church: construction started in 1945 and ended in 1986, but the landmark tower was completed long before the whole church was finished. The crypt beneath the choir was consecrated in 1948, the steeple and wings were completed in 1974, and the nave was consecrated in 1986.
The church houses a large pipe organ by the German organ builder Johannes Klais of Bonn. It has electronic action; the pipes are remote from the four manuals and pedal console. There are 102 ranks, 72 stops and 5275 pipes. It is 15 metres tall and weighs 25 metric tons. Its construction was finished in December 1992.
The church is also used as an observation tower. An observer can take a lift up to the viewing deck and view Reykjavík and the surrounding mountains. The church is still used today for modern services and weddings.
According to wikipedia.org