Have a look at this one. Like the Eiffel tower it is the result of a competition.
The Suomalainen brothers did the design for a church cut directy from the bedrock. They considered leaving the rock undressed but thought the idea was too unorthodox and may cost them the competition.
Well they won the competition. A conductor and engineer gave advice on acousitics and they discover that the bare rock gives the best acoustics. The church now has excellent acoustics and is often used as a concert venue.
The copper roof probably also sings along.
It was built in the 60’s. Lovely light through the big windows.