The Bethlehem Chapel is one plain hall, no aisles, no altar of consequence, arranged entirely around a voice. Jan Hus took charge of it on 14 March 1402 and preached in Czech here for eleven years, to ordinary people, at a time when sermons were normally in Latin. He was burned as a heretic at Konstanz in 1415, and the wars fought in his name reshaped Bohemia. From the floor the room explains itself: nothing stands between the congregation and the pulpit, and there is nothing else to look at.
Almost none of the medieval fabric is left: the hall you walk into was rebuilt in 1950–52 by the architect Jaroslav Fragner on the original foundations. The genuine survivals are few — stretches of old wall, the stone opening in the east wall, the doorway to the raised pulpit, and the preacher's lodging beside it. Two Prague citizens, Hanuš of Mühlheim and Jan Kříž, paid for the first chapel in 1391. The Czech Technical University has run the hall since 1987 and holds its ceremonies in it.