Gdańsk is the port city located on the Baltic Sea. It is the capital of the Pomeranian Voivodeship, cultural, scientific and commercial centre of northern Poland. In Gdańsk, apart from the nearby sea, there are many architectural monuments, which attract tourists. One of the most important constructions is the Oliwa Cathedral, which is the 107-meter-long brick basilica, erected in the Roman-Gothic style in the 13th century and extended in the second half of the 14th century in the Gothic style. Inside the cathedral there are 23 altars of great artistic value (built mostly in the Baroque style, but also in the Renaissance and Rococo).