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Here's a valuable Pokémon Go tip: If you're going to play the popular mobile game, make sure you do it in appropriate places!

Pokémon Go, which uses superimposes virtual characters them in real-world locations for people to find, has raised the ire of officials at Arlington National Cemetery, the United States Holocaust Memorial Museum, the 9/11 Memorial and other somber locations around the country.

The official Twitter account of the Arlington National Cemetery sent out a message to potential visitors, asking them to refrain from playing the game while on the nation's most hallowed ground.

Earlier this week, The Washington Post reported that people were hunting for digital Pokémon creatures at the U.S. Holocaust Museum.

"Playing the game is not appropriate in the museum, which is a memorial to the victims of Nazism," Andrew Hollinger, the museum's communications director, said. "We are trying to find out if we can get the museum excluded from the game."

There have also been reports of people playing the game at the 9/11 Memorial in New York City.

“I don’t think there’s anything wrong with the game itself,” Chris Desciora, a security guard at the memorial, said. “But you know, maybe the game’s services could consider where they are placing the Pokémon or whatever. You should come here to see everything and to respect the memorial not just to catch a Pokémon.”

Let us know what you think in the comments.

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