Organ recitals: Olaus Petri church Saturdays at 6 pm; Helsinki Cathedral Wednesdays and Fridays at noon. For other musical events in churches check the updated list here.
Suomenlinna Sea Fortress, Suomenlinna. is one of the biggest attractions in Helsinki. The historic fortified islands can be reached by ferry from the Market Square in around 15 minutes. The UNESCO World Heritage Site is open year round and can be explored on foot free of charge. You only have to pay for the ferry crossing, but public transport tickets are valid for the municipal ferry (2 euros per crossing).
On Holy Saturday the traditional Easter bonfires are lit at Seurasaari. According to ancient folk beliefs, Holy Saturday was the most fearful night of the year, when evil forces such as witches and trolls were about. It was believed that trolls would take the milk from cows and cut the hair off cows, sheep and sometimes horses. Bonfires were burned to keep the evil spirits away.
Season of Light, In early January famous buildings in Helsinki are illuminated by beautiful light installations, creating an enchanting atmosphere around Senate Square and Parliament House.
Uspenski Orthodox Cathedral, Kanavakatu 1. Completed in 1868 in the Katajanokka district of Helsinki, the Uspenski Cathedral is the largest orthodox church in Western Europe. With its golden cupolas and redbrick facade, the church is one of the clearest symbols of the Russian impact on Finnish history.
Temppeliaukio church, Lutherinkatu 3 (the Church inside the Rock). This church inside the rock, with its amazing architecture, is visited by half a million people each year. During the summer months and the peak season for tourists, the daily visitor count can reach up to 8,000 people.
Helsinki Cathedral, Unioninkatu 29. The Cathedral designed by C.L. Engel in splendid Neoclassical style. The work began according to his designs in 1830, and was completed after Engel's death in 1852. In addition to serving its own congregation, it is the scene of major state and university events, while exhibitions and concerts are held in the crypt.
Kammpi Chapel of Silence in Helsinki set on the Narinkkatori Square in downtown Helsinki is part of the World Design Helsinki 2012 programme - a modern timber construction offering place for retreat, mediation and worship. You may come here both - for a moment of silence or to admire an excellent object of modern architecutre. Open daily from early morning to the evening.