Heisterbach Abbey

The famous basilica of Heisterbach was (...) being built during the period of transition from the Romanesque round arch to the Gothic pointed arch, its style of architecture was a combination of the Romanesque and the Gothic.
Abbey ruins Heisterbach, which had large possessions and drew revenues from many neighbouring towns, remained one of the most flourishing Cistercian monasteries until its suppression in 1803. The library and the archives were given to the city of Düsseldorf; the monastery and the church were sold and torn down in 1809, and only the apse with the ruins of the choir remains.
Quelle: en.wikipedia.org/wiki/Heisterbach_Abbey