This 18 meter (60 foot) tall monolith is in northeast Minnesota, near the Canadian border. It gets its name because it is exactly that - magnetic. The area is a prime spot for [magnetite](http://www.minerals.net/mineral/magnetite.aspx) (Fe2+Fe3+2O4). It messes with compasses, and we brought magnets and they stuck right to the rock.
Scale is correctly adjusted for VR - should be pretty impressive.
158 images on my crappy Moto G3 camera, processed in Agisoft Photoscan. Scaled, oriented and added texture in Blender 2.78.