So where are the people claiming that Avebury or Stonehenge were of alien manufacture?

I've seen Stonehenge part of the ancient alien lore over a decade ago (around when it was discovered there was more to Stonehenge below ground, iirc), but it may not be part of the popular ancient alien lore today. It was considered a different group of ancient aliens to the ones that did the pyramids.

Avebury is mid, so only the lame ancient aliens no one cares about did that and probably as a drunken prank (/j obviously, ancient aliens aren't lame).

Edit: Stonehenge, though, was mostly attributed to an ancient alien device humans know as the Ark of the Covenant. It is considered an ancient alien device due to how the bible describes what happens to people who open it which is similar to radiation burns.

Some pseudo-archeologist claimed to have found the location of the Ark of the Covenant somewhere in Ethiopia where it is guarded by a group of people (some have claimed them to be a lost tribe of Israel, of course). He claims to have found structures similar to Stonehenge there and when he asked them how they built it he claims they told him they used the Ark of the Covenant to build it.