The Linnanmäki amusement park is opened for the first time in Helsinki.

Linnanmäki is an amusement park in Helsinki, Finland. It was opened on 27 May 1950 and is owned by the non-profit Children's Day Foundation, which operates the park to raise funds for Finnish child welfare work. In 2023, the foundation donated €4.5 million, and so far has donated a total of over €130 million to this cause.

Helsinki is the capital and most populous city in Finland. It is on the shore of the Gulf of Finland and is the seat of southern Finland's Uusimaa region. About 690,000 people live in the municipality, with 1.3 million in the capital region and 1.6 million in the metropolitan area. As the most populous urban area in Finland, it is the country's most significant centre for politics, education, finance, culture, and research. Helsinki is 80 kilometres (50 mi) north of Tallinn, Estonia, 400 kilometres (250 mi) east of Stockholm, Sweden, and 300 kilometres (190 mi) west of Saint Petersburg, Russia.

May 27 is the 147th day of the year in the Gregorian calendar; 218 days remain until the end of the year.