Ostrów Lednicki
Ostrów Lednicki is an island in Poland, on Lake Lednica. Ostrów Lednicki is located between Gniezno and Poznań.
The first settlement was built here in medieval times Remains of a chapel, church and palace, thought to be the home of the first Kings of the Piast dynasty. Today the ruins are of archaeological significance.
Source of description: http://en.wikipedia.org/wiki/Ostrów_Lednicki
wikipedia
Inside of Ostrów Lednicki you can also find: Museum of the Piast dynasty in Lednica ,