Helsinki, the capital of Finland, is a city teeming with beautiful buildings, lush parks, captivating museums, and delightful restaurants that make it challenging to explore everything in just one trip. To start, pay a visit to the majestic Senaatintori Square, home to the Senate building (where the Finnish government still operates), the University, and the main university library, renowned for its unique collection of Slavic literature. Don't forget to admire the Tuomiokirkko Cathedral. If you have the opportunity, reserve a day to explore the sea fortress "Suomenlinna," situated on seven rocky islands and recognized as a UNESCO World Heritage Site. The fortress houses several museums (including those dedicated to customs and toys), a naval academy, and even a minimum-security prison where inmates contribute to maintaining order. Entrance to the fortress is free, with charges applicable only for museum visits. Younger visitors to Helsinki have plenty of exciting options as well. In addition to the amusement park "Linnanmäki," kids can enjoy the zoo and the Sea Life marine center. A trip to Seurasaari Island is highly recommended, as it's inhabited by friendly and lively squirrels.