Hallgrímskirkja is a Lutheran (Church of Iceland) parish church in Reykjavík, Iceland. At 73 metres (244 ft), it is the largest church in Iceland and the sixth tallest architectural structure in Iceland. The church is named after the Icelandic poet and clergyman Hallgrímur Pétursson (1614 to 1674), author of the Passion Hymns.
State Architect Guðjón Samúelsson's design of the church was commissioned in 1937. He is said to have designed it to resemble the basalt lava flows of Iceland's landscape. It took 41 years to build the church. Construction work began in 1945 and ended in 1986, the landmark tower being completed long before the church's actual completion.

https://en.wikipedia.org/wiki/Hallgr%C3%ADmskirkja