This rather forlorn looking mound is what remained of the infamous Gibbet in the town. The street where it is situated is called Gibbet Street and there is a modern incarnation there today.
The Halifax Gibbet was an early guillotine, or decapitating…
CMBC Ref 087252. The Gibbet was a means of execution used in Halifax in the 16th and 17th centuries. This non-working replica was constructed on the site of the original in 1974.