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Main church of the "Old Town"; served as the bishop's church before the completion of the cathedral. The westwork's base is Romanesque, while the church's main parts are Gothic.
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Altstädtisches Rathaus
Imposing brick Gothic town hall with ornated gates, Roland statue. On the Old Town's marketsquare is the Ordonnanzhaus (an early 14th-century brick building, one of the oldest secular buildings in Brandenburg), the Renaissance Sekretariats- und Syndikatshaus and the Baroque Inspektorhaus.
Branch of the museum of local history, displays historical images of Brandenburg and old toys.
Jahrtausendbrücke
Bridge over the River Havel, connecting the Old with the New Town. It was completed in 1929, celebrating the millennial anniversary of the city.
Johanniskirche
Former Franciscan monastery; late-Gothic, two-aisled hall church built from bricks. It was severely damaged during the Second World War; the ruin was repaired after 2013, and is used partly as a church, partly as an event location.
Dom Sankt Peter und Paul zu Brandenburg
A first cathedral was erected in the mid-10th century, but it was lost during the Great Slav Rising. The present building was started in 1165, built from bricks and designed in a late-Romanesque to early-Gothic style. It is considered the "cradle" of Brandenburg and "mother" of all churches in the state. The cathedral is on an island (Dominsel) in the River Havel which also contains the cathedral's enclosure, the former knight academy, curiae, cathedral canon's houses and the Gothic St Peter's Chapel.