Not far from Sibelius Park, and closer to the central part of the city we were able to go inside the uniquely designed Temppeliaukio Kirkko, also know as Rock Church. Construction on the Church began in 1968 and was finished a year later in 1969. The architects chose a rocky outcrop rising about 40 feet above street level, and blasted out the walls from the inside. The underground Rock Church is built inside of a massive block of natural granite in the middle of an ordinary residential square, as shown here on this Google Map satellite image. Click on the image and you can easily see the copper dome supported by the vertical window panes that surround it.
The structure is barely visible from outside, with only the copper dome poking out of the rock. Inside, the church is circular and enclosed by walls of bare rock, and the ceiling is a giant disc made of copper wire, the design of which actually makes the ceiling look higher than it really is. The interior is lit by natural light streaming through 180 vertical window panes that connect the dome and the wall.
The combination of the stone, copper, metal, and glass makes for an interesting combination of shapes, textures, and patterns on the ceiling surrounding the copper dome, as illustrated in this short slideshow.