Helsinki is the Capital of Finland and the centre of the Helsinki Region, a functional urban region of about 1.4 million inhabitants and 751,000 jobs.
By decree of King Gustav Vasa of Sweden in 1550, the city was founded at the mouth of river Vantaa. From there, the city was moved further south to its present location in 1643.
Helsinki is by far the most populous urban area in Finland as well as the country's most important center for politics, education, finance, culture, and research.
More about Helsinki: https://www.hel.fi/helsinki/en
Helsinki has excellent public transportation throughout the city. The buses, trams and the metro are easily accessible and operate nearly around the clock.
(NB: If you're planning to use public transportation a lot, a travel card will be more cost-efficient than single tickets).
Information on tickets, routes and locations: