Little known to most people in America, the Carnac Stones are the largest collection of megaliths in the world!
People dated to the Neolithic era are said to have constructed Carnac.
But the builders of the site were not simply farmers.
There are indications of applied geometry - including the Pythagorean theorem of Greece and other complex math formulas.
This is way before the mainstream timeline of human history credits the use of these mathematical concepts.
Some theories suggest the site is the work of an advanced, antediluvian society while others have posited cryptic origins such as giants and transmutation magic... There may be a lost civilization that flourished in a super-ancient Europe and is still undiscovered to this day!