During excavation work on the site of the new public library, archaeologists found the ruins of what is thought to be Olavskirken, a church dating back to the mid-12th century.
Parts of the ruins and a number of well-preserved skeletons from the graveyard can be seen during opening hours in the courtyard between the old and the new library buildings.
In the basement of the savings bank SpareBank 1 Midt-Norge (entrance from Søndre gate) you will find the ruins of what archeologists think is the Gregorius church dating back to the Middle Ages. Discovered during archaeological excavations prior to construction on the new bank, the ruins can be viewed during normal opening hours.
Both sites will give you a unique look into Trondheim's more than 1000 years of history