The so-called cathedral is a child of the historicism of the 19th century and takes up the formal language of the Gothic. The church design comes from the master builder Wilhelm Rincklake from Münster, who chose the shape of a basilica for the nave. This means that the high central nave towers over the aisles. The length of the cathedral is 56 meters, the width 26 meters. The 100 meter high towers, whose helmets are covered with slate and copper, are visible from afar. Baumberger sandstone from the region was used as the material for the construction of the huge church.
Of course, the Billerbeck Cathedral has the relics of St. Liudger. They were transferred from Werden (Essen) to Billerbeck in 1735 on the instructions of Clemens August, Elector and Duke of Bavaria. The saint is also present in other places in the church, for example as a Baptist on a pulpit relief. The death chapel of the saint is located in the south tower of the cathedral. It is the main goal of the pilgrims to Billerbeck. The relief altarpiece was carved from Carrara marble and shows the death of the saint in the midst of his brothers. Another relic of St. Liudgers. In honor of this saint, a hiking trail from Coesfeld via Billerbeck to Tilbeck has been laid out. This also leads through the valley and the meadows of the Berkel, which flows not far from the Klovenburg. This hiking trail is marked in the footsteps of the first bishop of Münster with a curved white L on a purple background.