Kloster Maria Birnbaum, Baroque pilgrimage monastery in Sielenbach, Germany.

Kloster Maria Birnbaum is a Baroque pilgrimage church built between 1661 and 1668 by Constantin Pader for Teutonic Order commander Philipp Jakob von Kaltenthal. Its white walls carry a tall grey onion dome on a dark red brick drum, a taller tower with a balustrade and round windows, and smaller domes at both ends. It is regarded as the first domed church north of the Alps, with Italian influences in its design.

The complex was built between 1661 and 1668 under architect Constantin Pader's direction, commissioned by Teutonic Order commander Philipp Jakob von Kaltenthal. The project followed the desire to build a sanctuary at the site where a Marian image had been discovered a century earlier.

The place keeps alive the tradition of the Blue League, a farmers' association that protected the sanctuary, with members wearing blue cloaks during religious celebrations. This dress is still visible today and shows the close bond between the faithful and the holy site.

The monastery now serves as a novitiate house for the German Province of the Teutonic Order and offers regular religious services. Visitors should check opening times and wear respectful clothing to avoid disturbing worship.

The trunk behind the high altar is the hollow pear tree itself, into which the Sielenbach shepherd placed the mutilated Marian image after finding it in a pond; the church was built around the tree, which died in 1671. The image now sits in a cavity of the trunk on the altar.