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Photo: Paweł 'pbm' Szubert (talk), CC BY-SA 3.0 via Wikimedia Commons
The "Church of Our Lady" also dates from the Middle Ages but was partially rebuilt after the 1708 fire.
Vår Frue Church is a medieval parish church of the Church of Norway in Trondheim Municipality in Trøndelag county, Norway. It is located in the downtown Midtbyen area of the city of Trondheim, just a few blocks north of the Nidaros Cathedral. It is one of the two churches for the Nidaros og Vår Frue parish which is part of the Nidaros domprosti (arch-deanery) in the Diocese of Nidaros. The gray, stone church was built in a long church design in the late 1100s using plans drawn up by Bjørn Sigvardsson. The church seats about 540 people.
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Trondheim Science Center
A center for popularizing science, has lots of exhibits, of which many are interactive. Also has a gift store. It is home to one of Norway's largest planetariums which was opened in 2017.
The city library is built upon the ruins of a medieval church and some archaeological objects are on display. The building, which was built as the original city hall in the 19th century, is a remnant of the past. Also, being a library you can also borrow and read books, and it's the site of various events.
The central square is the hub of Trondheim. Surrounded by shops and cafés, it is often used for events. There are also vendors with market stalls that sell tourist kitch and souvenirs, food, clothes, accessories and other items. Not to mention Trondheim Torg, which is one of the city's largest shopping malls- home to clothing stores, bookstores, and restaurants and cafes. At the center stands an 18-metre-high statue of King Olav Tryggvason, the founder of the city. It is also a functioning sundial.
Nidarosdomen
This is the biggest church in Northern Europe, the only major Gothic cathedral in Norway and the pride of the city. Towering over the city centre at its southern edge, the majestic cathedral is the defining feature of Trondheim. Nidarosdomen is also Norway's national cathedral. It was erected over what was believed to be St. Olav's grave and it became a major pilgrimage site in Northern Europe. Next door is the Archbishop's Palace, which was partly burnt down in the 1980s and has been heavily restored.
Kristiansten festning
A fortress on a hill overlooking the centre. Have a walk in the area for views of Trondheim one can take the bus 25 to Ankersgata, or rent a bike and use the bike lift at Trampe.