Ostrów Tumski is an island and the oldest part of Wrocław. Surrounded by the River Oder, this former garden, which gave rise to the city of Wrocław, is now featuring a number of impressive monuments. The most prominent monuments include the Cathedral of Saint John the Baptist (restored after World War II), the Holy Cross and Saint Bartholomew’s Collegiate, which is a unique two-storey brick basilica.
Located on the island is also the Archdiocese Museum, which for more than one hundred years has been collecting sacred art, including the celebrated Book of Henryków. Dated to the 13th–14th centuries, the book is known to feature the first sentence to have ever been recorded in Polish (the document was listed in the UNESCO Memory of the World Register). This is the only place is Wrocław where you can see a lamplighter turning on the gas lamps at dusk.