Largest in Poland. Two tours to choose: World War II or Cold War.
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St. Jacob's Cathedral
Large Gothic cathedral.
Stare Miasto
Jokingly referred to by locals as "Brand New Old Town" (its reconstruction only started in late 1990s and is ongoing), it has some nice houses rebuilt to original plans. Many shops, restaurants and cafes. There is a museum situated in the Old Town Hall.
Palace under the Globe / Palace of Grumbkov
The building where two rulers of Russia (Catherine II and Maria Fiodorovna) were born.
Loitzs Tenement
Interesting tenement near the Old Town. Go from Old Town in direction of Castle, and you'll see it after about 20–30 m on the left side. It is painted flashy orange, you can't miss it.
Oldest cinema in the world still in operation (est. 1909).
Zamek Książąt Pomorskich
Houses a museum, restaurants and cafes, and also houses tourist information office, you can get some free maps, pamphlets etc.