The millennium-old Gdańsk is the sixth largest Polish city. Together with the spa town 
of Sopot, the city of Gdynia and suburban communities, forms a metropolitan area called the Tricity (Trójmiasto), with a population of over million.  Gdańsk is the richest historic site among the Baltic cities, a prominent member of the Hanseatic league. Most of the attractions are several centuries old (although it should be noted that many did not survive World War II intact and were rebuilt afterwards). These are located along the Droga Królewska (The Royal Tract), in the Main Town and the Promenade.
Restored houses, whose original designs date back to the 16th and 17th century and which used to belong to the patricians, imbue the city with a specific spirit. Among these is the Uphagen House, where a department of the Historical Museum of Gdańsk is located, as well as the Gothic-style Old Town Hall.
The Długi Targ (Long Market) - in the 13th century a merchants' route - is the home of the Fountain of Neptune, the city's symbol, as well as Dwór Artusa (Arthus' Court), Złota Kamienica (Golden House).
The island of Ołowianka hosts the building of the Baltic Philharmonic Hall, located in buildings adapted from 19th-century power and heating plants and visible from the Old Town's promenade. as well as the National Maritime Museum, located in the medieval granaries.
Another place worth mentioning is the Gdańsk Shipyard, where the fight against real socialism had one of its major chapters written. The square in front of the Shipyard is the place of the Monument to the Fallen Shipyard Workers commemorating the first three shipbuilders who died in December 1970. In August 1980 the shipyard was the birthplace of the “ ,Solidarność” labour union and freedom movement, which is  commemorated by the European Solidarity Centre, be built by 2013 and forming a complex of museum and conference facilities. 
Among other tourist sites there are Westerplatte, where the World War II began, and the Cathedral in Oliwa, with amazing baroque organ and surrounding wonderful park. 
Gdańsk is also a popular tourist destination because of its numerous beaches, piers, cultural events and coastal attractions, which attract young and old alike.
Interesting sites about Gdańsk:
http://www.staypoland.com/about_gdansk.htm
http://guide.trojmiasto.pl
http://www.shopandsee.eu
http://www.gdansk-life.com/info/info.php