It has been in large part rebuilt since a fire in 1836, and possesses a castle, with various collections, a museum of antiquities, an old town hall and churches.
Other buildings of note are the massive episcopal palace (1470-1500), afterwards a royal palace, and the old gymnasium founded by Gustavus Adolphus in 1627, which contains the valuable library of old books and manuscripts belonging to the diocese and state college, and collection of coins and antiquities.
He also added to the Vatican library, and began a collection of antiquities.
The Provincial Museum (1885-1889) contains many Roman and medieval antiquities.
The palace contains a picture gallery and collections of natural history and antiquities, and in front of it are two monumental fountains and a monument to the emperor William I.