Notre-Dame Cathedral is a church founded in the 17th century by the Jesuits. The church owes its current size and neo-Gothic style to a 20th century expansion. The crypt of the church contains the tombs of the grand-ducal family.
Saint-Jean-du-Grund is a church from the very beginning of the 18th century, which once belonged to the Benedictine Abbey of Münster. The interior contains a baroque choir, a beautiful 18th century organ and, in one of the chapels, a black Madonna and Child, carved around 1360, which is the object of great veneration.
The church of Saint-Michael was founded in 987 as the chapel of the castle of the Count of Luxembourg. Destroyed and rebuilt many times, the appearance of the present church owes much to its reconstruction in the 17th century, including the construction of the present tower (1648). The church has a beautiful listed organ dating from 1609.