The Cryptoporticus of Reims is is a very well preserved third century AD Roman passageway. At the time, Reims was a Gallo-Roman town known as Durocortorum.
Like other structures of this kind, the Cryptoporticus of Reims was a semi-subterranean arched passageway, the roof of which would have been a walkway. It would have been one of three such passageways surrounding the forum of Durocortorum.
The Cryptoporticus of Reims is an excellent example of this type of Roman architecture, particularly as it is so very well preserved.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.