Spy pics for the upcoming sequel "Avengers: Age Of Ultron" have been hitting with some regularity, and the latest might be the most revealing yet.

Potential spoilers for "Avengers: Age Of Ultron" past this point!

This is pure speculation, because I have neither read the script, nor have any inside info on the movie. However, there have been persistent rumors than the sequel will pick up with the team attacking Baron Strucker's (Thomas Kretschmann) stronghold somewhere in Europe, and coming into battle with Quicksilver (Aaron Taylor Johnson) and Scarlet Witch (Elizabeth Olsen).

What we do know for sure is that Strucker was last seen in an unknown stronghold during the credits of "Captain America: The Winter Soldier," holding "The Twins" prisoner in clear glass cells. Strucker works for the evil organization HYDRA, and is in possession of Loki's scepter from the end of the first "Avengers."

We also know from "Marvel's Agents of S.H.I.E.L.D." that Strucker's bunker is one of the HYDRA outposts still held hostage well after the events of "Winter Soldier," and that what's left of S.H.I.E.L.D. is still looking to get that building back.

With all that in mind, as well as rumors that cite the opening scene having a fight in a forest, take a look at these pictures from the set, just snapped the other day, and see what you think:

Thor (Chris Hemsworth) knows it's hammer time, getting ready to fight someone. Later pics show Thor battling someone clad in black, but it's unclear who.

Sure looks like a bunker to us. Is that the entrance to Strucker's hide-out?

Sweet gun, and it definitely looks like HYDRA tech to me.

This winter soldier isn't wearing a uniform we've seen before, and certainly doesn't have a HYDRA mask on. Still, it could mean anything.

What do you think? Are these pics from the opening scene? Or somewhere else in the movie? "Avengers: Age Of Ultron" opens in theaters on May 1, 2015.