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  Campus Martius Detroit
Credit: Library of Congress, Prints and Photographs Division, Detroit Publishing Company Collection.

Campus Martius in Detroit about 100 years ago.

Theatrum Pompei Project Public Domain Document
The oldest Campus Martius was in ancient Rome. Includes the Pantheon. See model at left.

Wikipedia link

Champ de Mars is a public park in Old Montreal quarter of Montreal, Quebec, Canada. Wikipedia link

Champ de Mars is a large public greenspace in Paris. Wikipedia link

The Field of Mars or Marsovo Polye is a large park in the center of Saint-Petersburg, Russia. Wikipedia link