Why it's the capital
In 1596 King Sigismund III Vasa moved his royal court to Warsaw, and the city became the capital of the Polish Crown and of the Polish–Lithuanian Commonwealth.
Capital of PolandWarsaw stands on the Vistula River in east-central Poland, about 260 km from the Baltic Sea and about 300 km from the Carpathian Mountains.
In 1596 King Sigismund III Vasa moved his royal court to Warsaw, and the city became the capital of the Polish Crown and of the Polish–Lithuanian Commonwealth.
Tap a little east of the middle of Poland, on the Vistula River. Vilnius is about 390 km to the north-east.
Kraków, in southern Poland, was the official capital until 1596, so players sometimes tap it instead of Warsaw.
Sources: Wikipedia: Warsaw, Wikipedia: Mermaid of Warsaw, Wikipedia: Marie Curie, Wikipedia: Kraków