By Anna Grybel

Kraków - the cultural capital of Poland and IT cluster; Wrocław - the fastest growing city in Poland; Tricity, with the largest port on the Baltic coast and Poznań - the city of trade. They are classified as Poland's second tier cities.

Each city acts as a leading location in its region, administrative and university centre, transport hub and tourist magnet. They are to their regions what Warsaw is to Poland.

Their economic indicators are less strong than Warsaw's, but they still perform well above the national level. Their economic background is very strong - well educated and skilled workforces, low unemployment, very high FDI inflow, successful job creation and they offer the highest and the fastest growing wages in Poland outside the capital.

Due to their economic dynamism and lifestyle appeal, these cities are attracting a great number of migrants, which in turn creates further economic dynamism.