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Here's an ideal itinerary for 6 days in Helsinki:
Temppeliaukio Church, also known as the Rock Church, is a unique church in Helsinki that was built directly into solid rock. The interior features natural light pouring in from a skylight and beautiful acoustics, making it a popular venue for concerts.
The Museum of Finnish Architecture in Helsinki showcases the history and development of Finnish architecture from the 19th century to the present day. It features a collection of drawings, photographs, models, and other artifacts that highlight the unique style and innovation of Finnish architects.