A new poster for Transformers: The Last Knight indicates that Stonehenge may have an important role in the history of the Transformers. The marketing for the sequel has been teasing a more expansive mythology than in previous installments, with the character of Sir Edmund Burton (Anthony Hopkins) at the center of it. The “secret history” of the Transformers will span multiple eras in history, including World War II-era Germany and the dark ages, and it appears that Stonehenge will also be a big part of it.

Stonehenge, believed to be built as far back as 3000 B.C., was the product of a civilization that left behind no written records explaining its construction or function. It has led the prehistoric monument in southern England to be one of the world’s great ancient mysteries and the subject of many debates. But based on a new poster for Transformers 5, it appears that the monument will be explained as it relates to the Transformers mythology.

A new poster for The Last Knight has been released that gives a lot of information. Featured most prominently are Optimus Prime and Bumblebee, who tower over stars Mark Wahlberg, Hopkins, Laura Haddock, and (presumably) Isabela Moner. Featured less prominently is Cogman (Jim Carter), a human-sized transformer who is Burton’s servant. In the background is what appears to be Unicron. But the most intriguing detail of the poster is Stonehenge appearing at the bottom with a bright beam of light shooting out of it.

It was already known the film had filmed at the momument, but Stonehenge’s presence in the poster suggests that the movie will indeed be playing with the mysteries of its construction, most likely saying the design is somehow linked to the history of the Autobot and Decepticon war. The film, of course, will also prominently look at another piece of English history with a major influence by the King Arthur legend, but despite the prominence of medieval times and Nazi Germany in the narrative, it’s seeming that Stonehenge will hold the key to it all.

Of course, The Last Knight is taking considerable risks in what appears to be an attempt to “explain” the significance of Stonehenge; whatever it turns out to be, there’s always the chance that it falls flat or is as banal as what Bay did with the Pyramids in Revenge of the Fallen. Here’s hoping with The Last Knight he’s learned from that.