The church is noted for its early 15th-century frescoes and for its elaborate Baroque altarpiece and pulpit, both woodcuts by Abel Schrøder.

Correspondence from 1357 to 1492 documents the early pilgrimages to Undløse and the various related religious ceremonies, all encouraged by a nearby sacred source.

[2] The altarpiece (1644) and pulpit (1643) were crafted by the woodcarver Abel Schrøder and presented to the church by the vassal Frederik Reedtz and his wife.

[2] The frescoes on the vaults and arches in the nave are attributed to the workshop of the Union Master (Danish: Unionsmesteren), which was active in Zealand and Scania from in the early 15th century.

[2][5] The colours have almost disappeared as restoration work undertaken after the murals were uncovered in 1918 centred on cleaning the white areas, leaving the remainder untouched.

They depict the Nativity (based on the vision of St Brigit of Sweden who is also shown in the scene), the Resurrection, the Ascension and the Day of Judgment.

Notable burials include politician Jacob Brønnum Scavenius Estrup (1825-1913) and the opera singer actress and journalist Helle Halding (1934-2007).