The Douaumont ossuary in northeast France contains the remains of some of the more than 300,000 French and German soldiers who died in the Battle of Verdun, one of the bloodiest of the 1914-18 conflict.
In 1984, then French president Francois Mitterrand visited the site with West German chancellor Helmut Kohl, with the pair joining hands to symbolise their countries' post-war reconciliation.
Both the underground ossuary and the plaque commemorating the Mitterrand-Kohl handshake featured in the Pokemon Go smartphone app until last weekend when the game's creator Niantic removed them at the site's request, Douaumount spokeswoman Elodie Farcage said.
A spokeswoman for the nearby Verdun Memorial said it too was listed as a Pokemon gym. "But we have no Internet network here so the players cannot use it," Emeline Villeseche said.
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The mayor of the area told AFP he would ask Niantic to remove it.
The French battlefields are not the first memorials to send players of the global sensation packing.