Temppeliaukio Church (Temppeliaukion Kirkko), Helsinki

One of the biggest success stories in modern Helsinki architecture, Temppeliaukion Kirkko's design initially roused controversy because it involved a large hole in the granite outcrop covered with a concave roof. There are no ornaments, belfry or altar. Criticism is now a thing of the past and it receives about 500,000 visitors annually. The stonewalls and metal ceiling give a feeling of warmth and security. The temple is also an excellent venue for musical events; the acoustics are superb, attracting many of the world's best organists.