The remains of the castle of Guingamp, known as Peter II, allow an open reading of the construction-reconstruction of a castle on itself. Between 1034, date of the first feudal mound and 1626, date of the setting up of the last castle on the order of King Louis XIII, three typical fortresses of their time, succeeded each other on this site.
The materials resulting from the demolition of the castle were used for the construction of the convent of the Augustine Hospitallers (now the Town Hall). Today, this founding place of the city of Guingamp, long closed to the public, is finally open. The accessibility of the south curtain allows to appreciate a unique panorama.