KEY POINTS:
The Polish capital has finished its first subway line, started 25 years ago.
Warsaw was yesterday offering free travel on the new 23-stop underground line which runs about 20km between the city's north and south.
Construction began in 1983 under the communist government but was slow due in part to a lack of equipment. Seven years later communism fell but money was short.
City authorities plan to build a second, east-west line.
