This church dates back to the 12th century and is remarkable for its extraordinarily preserved Romanesque architecture.
Wikipedia (Polish) http://pl.wikipedia.org/wiki/Rotunda_%C5%9Bwi%C4%99tego_Prokopa_w_Strzelnie
Address Klasztorna 2, 88-320 Strzelno, Poland
Coordinates 52°37'48.971" N 18°10'43.868" E