Louisenlund is a Danish prehistoric site about 50 monumental stones scattered among the trees. In the past, there have been several more. Many of them are over 2.5 m high.
Louisenlund is circa 3.5 km east of Østermarie. Together with Gryet, north of Sankt Bodil Church, it forms Bornholm's largest collections of monumental stones.
A study of Louisenlund has never been carried out, so no one is sure about the function of this site. why the stones were erected.
In Gyldensåen approx. 150 m south of Louisenlund is a large rock in the northern bank of the river called Fænrisstenen. The stone is a walking block.
On its surface are five elongated depressions, clearly produced by man-made work, and probably by the fact that in a distant past the stone has been used as a grindstone for pointed weapons.
Attached to this stone is a legend: the giant Fænris, who lived in the Hills of Hell, was so upset by the eternal ringing of the bell from Ib's Church that he threw the Fænris stone after the church from Aarsdale. But when he threw with his left hand, the pressure became so strong that the hand left traces in the stone, which was instead thrown high above the church to the river south of Louisenlund.