Cathédrale Saint-Pierre et Saint-Paul. Construction of this Gothic cathedral began in 1208, with work continuing until the 17th century.
Only one tower, St Peter’s, was built, and thus the building remains unfinished. A steeple, 110 m high, once stood over the crossing,
but it was damaged by a tornado in 1365, and struck by lightning in 1700, after which it was never rebuilt.