Word of warning: be careful about pulling up your bedroom floor in Norway, you might just come across a Viking grave underneath, like this couple in Bodø.
( Photos/source: https://www.nrk.no/nordland/antatt-vikinggrav-oppdaget-under-hus-i-saltstraumen-1.15028837)

(This was previously unknown, looked like rubble, and they stopped digging when they found the artefacts. Archaeologists are now investigating!)