Bayer's Lake Mystery Walls

The Bayer's Lake Mystery Walls are stone ruins of unknown origin in Halifax, Nova Scotia, consisting of a small five-sided building outline and a 150-metre wall with ditches, both built from flat-surfaced ironstone slate on a hillside overlooking Bayers Lake Park. Theories about their purpose range from sheep pens to military defences, possibly connected to preparations for the 1758 siege of Louisbourg or the War of 1812. A 1998 lichenological study determined the stones had not been disturbed for at least 200 years, placing construction within decades of Halifax's 1749 founding. The site was nearly destroyed during the development of the Bayers Lake Business Park in 1990 but was saved and is now protected under Nova Scotia's Special Places Act.