Sneaky little challenge if you're in the area. Cache within 15 meter radius of the marker.
Interesting sidenote about the location. The park is filled with skeletons as it was once a dedicated cemetary. A few years ago when the nearby electricity box was being built next to the gz, it disrupted the skeleton of a ww1 soldier and witnesses also saw the identification discs (dogtags) wrapped around the ribcage bones.