Already in 735 a Christian Church stood in Aldersbach. Cistercian monks built in the 12th century a monastery and a monastery Church. The three nave Romanesque Basilica was consecrated in 1207. The 68 meter high church tower was built in 1410 and in its current form designed in 1755. During the "golden age" was the ship in 1720 by Domenico Magzin newly built and decorated by brothers Cosmas Damian and Egid Quirin Asam in Rococo style with frescoes and stucco. Under the Rococo prelate Theobald II was "Maria Ascension" the most beautiful Maria Church in Bavaria, the Baroque wish of a heaven on Earth. Seemingly weightless rocks the organ gallery in space, worn by two more than life-size stucco angels, central medallion with a lavishly decorated our Lady and the monastery coat of arms. Fresco of the ship from the entrance to the choir. The main building shows the birth of Christ. The canopy-like high altar rests on a double serpentine column, depicting the Holy Trinity surrounded by 88 angels, a 1723 carvings by Matthias Goetz and marbled in bright tones. The altarpiece shows an allegorical representation of the Renaissance, a so-called lactation: the Holy Bernhard kneels for the mother of God and is powered by the "milk of wisdom", including the saints of the old and New Covenant and Cistercian Saints. The altarpiece is flanked by huge Baroque figures of St Peter and Paul. Above the Tabernacle dominates the Baroque 1620 Maria image (Hans Degler) and is framed by two kneeling Angels Adoratio Meditatio, beside it and silver busts of Saint Ursula and Eugenie and two three-part rotating relics are the lateral end. The beautiful late Rococo choir stalls from Walnut veneered decorated with intarsia is believed by brother Kaspar Grießemann created. The marbled wood-carved and gilded with gold leaf pulpit is by the sculptor Joseph Deutschmann (Passau).