Gibbet of Montfaucon

The Gibbet of Montfaucon was the main gallows and gibbet of the Kings of France until the time of Louis XIII of France. It was used to execute criminals, often traitors, by hanging and to display their dead bodies as a warning to the population. It was a large structure located at the top of a small hill near the modern Place du Colonel Fabien in Paris, though during the Middle Ages it was outside the city walls Wikipedia