Jellhaugen is the second largest burial mound in Norway and among the largest in Scandinavia and Northern Europe. It has a diameter of 85 metres and a height of around 9 metres. It's difficult to know exactly how old it is, but another nearby burial site known as the Jellhaugen Mound has been dated to around 1,500 years ago.
A saga tells that the mound is buildt for a king called Jell, however these tales are from more modern times and cannot be trusted. The mound is not completely excavated, only parts of it have been excavated, in 1968 however, it was dug a ditch trough the centre of the mound and the only findings was a cremation grave with burned human bones and a single amber pearl. The grave has been carbon-dated to around 426-598AD, the end of the age of migration. Traces of a early grave robbing was dated to around 692-896AD.
In 2018, using high-resolution ground-penetrating radar, archaeologists have found an ancient Viking cemetery, complete with what appears to be a well-preserved ship burial. A popular mode of interment among the Norse Vikings, ship burials consisting of a longboat covered by a mound were reserved for important personages, such as chieftains.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.