The Turkish archeological site of Gobekli Tepe, as written about in the Smithsonian Magazine article, provides evidence that

Gobekli Tepe was a place of worship

Explanation:

The Turkish archeological site of Gobekli Tepe, as written about in the Smithsonian Magazine article, in 2008 by Andrew Curry. It was considerable documentation of research studies carried out on the place.

In the article, it was revealed that Schmidt, a member of the German Archaeological Institute, from his research concluded that due to lack of evidence that people permanently lived on the land of Gobekli Tepe, then it can be inferred that "this was a place of worship on an unprecedented scale... cathedral on a hill."

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it was displayed because they had a love for war