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Here's an ideal itinerary for 4 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.
Helsinki Zoo is a popular attraction located on the island of Korkeasaari in Helsinki, Finland. It is home to over 150 animal species from around the world, including rare and endangered species. Visitors can enjoy a variety of exhibits, shows, and activities for all ages.