Sulejów Abbey was a Cistercian abbey founded in 1176 by the duke Kazimierz II the Just. The town of Sulejów grew up round it.
Wikipedia https://en.wikipedia.org/wiki/Sulejów_Abbey
Official Website http://www.zamkilodzkie.pl/pliki/sulej.htm
Address 97-330, Poland
Coordinates 51°21'50.599" N 19°52'42.864" E