The Paul-Gerhardt-Kirche (originally St Nicholas's Church) in Lübben is a brick-built Late Gothic hall-church with a richly furnished interior. It was the last charge of the famous 17th C. Protestant pastor and hymn-writer Paul Gerhardt, who is buried in the church. There is a monument to him outside the church.
The Schloss in Lübben is in Late Renaissance style. Particularly fine are the east gable and the sandstone doorway on the north side with the arms of the Electorate of Saxony. The Heraldic Hall (Wappensaal) in the tower containing the residential apartments has been restored.
The old Baroque Ständehaus (House of the Estates; now the Municipal Archives) also has the arms of the Electorate of Saxony on the doorways.
Lübben still preserves some remains of its old walls - the round Hexenturm (Witches' Tower), the square Trotzer and a wiekhaus (a house built into the wall), with Gothic blind arches and tracery.