The Dom is the largest and most important building in Münster — a Gothic cathedral of serious scale, its twin west towers (57 and 55 metres) visible from much of the city centre. Construction of the current structure began in 1225 and the building was consecrated in 1264, though the facade with its remarkable porch has older Romanesque elements incorporated from the earlier cathedral that preceded it.
The interior holds several things worth seeking out. The treasury (Domkammer) contains medieval goldsmithing, reliquaries, and vestments of high quality — one of the better cathedral treasuries in Westphalia. The tomb of Cardinal Clemens August Graf von Galen, beatified by Pope Benedict XVI in 2005, is here; von Galen was the "Lion of Münster" who publicly preached against Nazi euthanasia programmes during the war, an act of considerable personal courage. The cloister, connecting the cathedral to the surrounding buildings, is quiet and worth a slow walk.