That makes sense, because for the most part it was designed by people who were born and trained in Europe.
The Citadelle was designed by a British army engineer, Elias Walker Durnford. The Château Frontenac was designed by an American - Bruce Price - but the style used was Châteauesque, an architectural style inspired by the châteaux of the Loire Valley in France.
The ramparts - the stone walls surrounding the Old Quarter of Quebec City - were mostly built according to plans made by French military engineers, with updates by the British after the British took control of the territory of Quebec.
Both of these are built in the “star fort” style, which helps defend against cannon fire - and another interesting connection between these two forts:
The designer of Fort Ticonderoga, Canadian-born French military engineer Michel Chartier de Lotbinière, Marquis de Lotbinière (1723-1798), was the son-in-law of Gaspard-Joseph Chaussegros de Léry (1682–1756), who did significant work on the battlements at La Citadelle in Quebec City after 1745. (de Léry did not do the star fort style there - the British did that after the War of 1812 - but it’s interesting to note the two forts have a family connection.)
You make me think of Naarden, 17th century fortified town close to Amsterdam. Still intact and certainly worth a visit. It’s also part of the 19th century Dutch Waterlinie which is worth a post in itself.
That is amazing, not just in terms of its architecture but in terms of all the manual labour involved in moving all that earth. What am amazing piece of engineering and human effort
Me 
