Inevitably I am unfamiliar with the vast majority of the historical literature. However, the historiography of late antiquity and the early middle ages features

Inevitably I am unfamiliar with the vast majority of the historical literature. However, the historiography of late antiquity and the early middle ages features very much debate as to how much people travelled; the possibility of travel is always entertained. As for Stonehenge, I am unaware of any substantial connexion with the Vikings. I am aware of recent findings concerning the DNA of those who built it, but the raid on Lindisfarne is separated by at least a millennium from the latest posited dates of construction of Stonehenge. The monographs I have read concerning Byzantium do not refer to the Vikings particularly frequently. This is unsurprising. The Vikings were important, but not sufficiently important to merit repeated and deliberate reference without some other obvious justification.