[inglor_cz]

Maybe you are just really, really determined to find racism in everything? Your claim is wildly wrong; I live in Europe and there is no shortage of kookiness and crackpotry around all the megalithic structures that dot the landscape, down to having actual cults worship them.

This isn't recent either. When Tolkien put the lines about Orthanc and the Stone of Erech looking unearthly into the Lord of the Rings, he reflected on the early Medieval people and their superstitions regarding Roman ruins. "There once was a race of giants that built X" was a common idea, and fanciful medieval authors would invent all sorts of humanoids that weren't human and were responsible for various wonders or evils.

Burial mounds in Ireland (sídh) are linguistically associated with the "fair folk" (aos sí) until today.