We would not have been able to move the stones into those positions, aliens would have been able to.

• Stonehenge is around 5000 years old. It dates back to around 3000-2000 BC. When we think about society at those times, we don’t know too much. It was before Rome, and certainly before cranes and electricity.
• So, how would they have created stonehenge? The stones were not originally there, and they were certainly not originally in that position. The people of that time, did not have the materials or the logistics to move the stones into those positions.
• Instead, perhaps Stonehenge was not there by human intervention, as humans nearly couldn’t have created it. Perhaps, it is there by a supernatural or extra-terrestrial intervention. They would be able to move the stones into those positions.

Stonehenge is certainly a mystery, given how much physical labor and across-time coordination was required to build it. The most commonly held explanations for how it was built:

• Stonehenge was built in a number of stages, over the course of an estimated 1500 years.

• Neolithic people used primitive tools to build the circular ditch on Salisbury Plain. Several hundred years later, builders hoisted bluestones (the smaller of the two types of stones making up the monument) into place. The larger sarsen sandstone slabs were placed in an outer circle formation many years after that, likely around 2000 B.C. Radiocarbon dating proposes that work on the monument continued until near 1600 B.C.

• New research has revealed that the source of the sarsen stones was West Woods, on the edge of Wiltshire’s Marlborough Downs. The bluestones have been traced to Preseli Hills, Wales.

• The feat of building the monument was enormous. For the bluestones, people think the builders created sledges and rollers out of tree trunks and/or used oxen; another common theory holds that the boulders were transferred onto rafts and floated down the Welsh coast up to the River Avon and onto the Salisbury Plain. For the sarsen stones, it is thought that builders used ropes and sledges for aid in transporting.

• There has been some theorizing of glacier activity taking the brunt of the work---although generally not accepted as a very likely explanation, it's possible that glaciers during the last ice age carried the bluestones closer to the Stonehenge area.

• It's also possible that part of Stonehenge was originally built in Wales and then transferred over to Salisbury Plain by hand. Different methods of doing this have been hypothesized, such as ball bearings in wooden tracks.

• Most approximations say that it took at least 30 million hours of labor over the course of the estimated 1500 years it took to build Stonehenge. Given the tools that were available to the builders during this time, both for the movement of the stones and the forming of them, this makes sense.

• Overall, it is, indeed, a very mysterious thing to think about: This coordinated project of probably 30 million or more hours of labor across a thousand or more years during the Neolithic period! The social structure to maintain such coordination is fascinating to think on---it seems likely some relatively advanced social organization would have been necessary for the building and maintenance of the monument. In addition, the will to produce such a thing must have been incredibly strong for it to keep going as it did. It was used as a burial site, so perhaps that serves as an explanation for the force of the will to continually build it. Beliefs around life and death are some of the strongest motivators there can be.

• Finally, theories about alien intervention in the building of the monument have existed for a long time. Considering just how much labor was required to erect the thing, Stonehenge builders might have benefited from some extraterrestrial help, the theory goes. Especially if one doesn't quite buy into the notion of such a sustained, coordinated effort---and such a profoundly developed will to keep the project going.

• However, considering there is evidence for the continued work across thousands of years on just such a project, it's harder to support the extraterrestrial intervention theory. If aggregated radiocarbon dating showed an instant erection of the stones, perhaps more skepticism would be warranted. It's never impossible, of course, and if the alien theory did happen to be right, there could be all kinds of reasons the extraterrestrial building project itself would have taken (or, more aptly, shown up to be) thousands of years in the making. We just don't know. Any way it's looked at, Stonehenge is an amazing mystery, indeed.

Stonehenge was built by humans, it just took them a while.

There are a total of 83 total stones at the Stonehenge site. The large stones are called sarsen stones which were transported 30 miles to the site. Because of the size and weight of these stones, the distance they had to be transported and the fact that this all took place before machinery and metal tools leads people to believe that aliens build Stonehenge. However, it is estimated that it actually took 10 years to get all of the sarsen stones to the monument size and 10 years tor the masons to prepare everything for Stonehenge. And not only this, the earthwork was started in 3000 BC and everything else was done over a timescale of hundreds of years. Around 500 years after the groundwork, the stones were brought to the site and erected. The sarsens were then shaped using sarsen hammerstones. Around 2200 BC the smaller stones were rearranged and around 1750 BC carvings started to be made on the upright sarsens.

There is a more logical conclusion to Stonehenge than aliens, in my opinion.