The 19 Most Incredible Churches and Cathedrals Around the World January 3, 2017 by Justin Andress View All On 1 Page 3. The Lutheran Church of Hallgrímur Is the Fourth Tallest Architectural Structure in Iceland Begun in 1945, the Church of Hallgrímur in Reykjavik, Iceland took 38 years to complete and stands more than 240 feet tall. panoramio.com 3 of 19PreviousNext