1. Helsinki Cathedral
Helsinki Cathedral is the most recognizable landmark in the city, standing tall on the edge of Senate Square. Designed by the architect Carl Ludvig Engel, it was completed in 1852 and was originally called St. Nicholas' Church. The bright white facade and green domes are visible from far out at sea as you approach the harbor. It is one of the primary places to visit in Helsinki for anyone interested in history and architecture.
The building is shaped like a Greek cross and has twelve statues of the apostles guarding the roofline. Inside, the design is very simple and clean, which is typical for Finnish Lutheran churches. You can see a large organ and a plain altar that contrast with the grand exterior of the building. In recent years, a small entrance fee has been introduced for tourists to help with the maintenance of the historic structure.
Steps leading up to the cathedral are a popular spot for both locals and tourists to sit and enjoy the sun. From the top of the stairs, you get a great view of the square below and the surrounding neoclassical buildings. The cathedral is still an active church, so it might be closed to visitors during weddings or special services. It is especially beautiful at night when the whole structure is lit up.