Mageroy is considered as one of the major Gallo Roman sites in Belgium. The ongoing excavations have revealed a 3 hectares agriculture complex, enclosed by a perimeter wall as well as the largest basin found North of Gaul. The main building was built in the early 2nd century AD and it was in use until the end of the 3rd century.
Trondenes Church is the northernmost medieval stone church of Norway. Though frequently mentioned as a 13th-century church, dating based on dendrochronology places its completion shortly after 1434. Compared to the other ten north Norwegian medieval stone churches, Trondenes church is well preserved and the exterior is close to the original state. The nave is 22.6 metres long and the chancel is 13.5 metres, making it one of the largest medieval churches of rural Norway. In the late Medieval period, Trondenes served as the main church centre of Northern Norway.
The church is especially known for its rich decorations, including three gothic triptychs, one of which is made by the German Hanseatic artist Bernt Notke. The baroque pulpit is equipped with an hourglass to allow the minister to time long sermons. The organ dates from the late 18th century. In the choir section, one can see remnants of medieval frescoes.
The church is probably the third church on the site, the first stave church was built in the 11th century, the second in the 12th. The second church was fortified with stone walls and ramparts, remnants of which can be seen around the church.The church used to have a little turret, which was demolished. Now the bells are rung from a little tower in the graveyeard.