We got double tourist-trapped.
This turf-roofed cottage is a replica, built by the organizers of the sorcery museum to illustrate what life was like for Icelanders during the age of witchcraft, roughly in the middle of the last millennium. Authentic construction techniques and materials were used, and elements such as doorways and support beams carry appropriate magical runes. A mannequin lies in a hay-stuffed bed, reading a grimoire.
The grounds also feature a giant's chair.
The hotel next door (the only commercial structure for 20 kilometers) sells books and souvenirs.