Cambrai must have looked impressive to the 16th century traveller, with its five kilometre enclosure reinforced with bastions, its fifty towers and seven city gates.
The town extension unfortunately had reason for these fortifications in the 19th century; there are many remains however.
The most extraordinary is the network of underground countermines [1], constructed undre Charles Quint citadel of wich we can still see the gate, arsenal and barrack buildings.
The most curious is the (...)