Helsinki is the capital of Finland. It is located on the shores of the Baltic Sea, in Southern Finland. The population of Helsinki is about 650000 people, which makes it the largest city in Finland. In total, the metropolitan area of Helsinki has about 1,48 million people when the adjacent areas of Espoo and Vantaa are included. The most popular sights are Suomenlinna, Tuomiokirkko, Eduskunta (the parliament) and the Central Railway Station.
You can find a 3D-model of the city here:
More info on the sights, restaurants, and other practical things is found here:
More info on Helsinki: https://www.hel.fi/helsinki/en
WSSC will provide transportation tickets for everyone to use in Helsinki. The public transportation in Helsinki is provided by HSL by trains, metro, trams, and buses. A route planner can be found here:
https://m.reittiopas.fi/en/ (also available as an app)