Château d'Arques-la-Bataille was originally a motte-and-bailey castle built to the steep hill around 1050. The castle was reconstruted in the 12th century. The long curtain wall and moat surrounded the Norman style donjon, a keep. The castle saw several battles and besieges during the centuries; the rebellion in 1052, Hundred Years' War and the most well-known in 1589 as part of the Wars of Religion. In 1688 the château was abandoned and later partially demolished and sold as the private property. Today the magnificent Château d'Arques-la-Bataille lies in ruins.References:
The Amphitheatre of the Three Gauls was part of the federal sanctuary of the three Gauls dedicated to the cult of Rome and Augustus celebrated by the 60 Gallic tribes when they gathered at Lugdunum (Lyon). The amphitheatre was built at the foot of the La Croix-Rousse hill at what was then the confluence of the Rhône and Saône.
Excavations have revealed a basement of three elliptical walls linked by cross-walls and a channel surrounding the oval central arena. The arena was slightly sloped, with the building"s south part supported by a now-vanished vault. The arena"s dimensions are 67,6m by 42m. This phase of the amphitheatre housed games which accompanied the imperial cult, with its low capacity (1,800 seats) being enough for delegations from the 60 Gallic tribes.
The amphitheatre was expanded at the start of the 2nd century. Two galleries were added around the old amphitheatre, raising its width from 25 metres to 105 metres and its capacity to about 20,000 seats. In so doing it made it a building open to the whole population of Lugdunum and its environs.