Newgrange is nestled in eastern Ireland and many believe the structure to be a religious site with 5,000-year-old roots. While the edifice’s purpose is shrouded in mystery, many speculate that its functions were largely religious given the way the rising sun floods the interiors during the winter solstice.

Dating back to 3000BC, the difficult to pronounce Hulbjerg Jættestue is a burial spot in Denmark. Upon its discovery, forty corpses were found inside, one of which showed early examples of dentistry.

Monte d’Accoddi is an archaeological site in Sardinia, Italy, and archaeologists believe the former structures were erected between 2700 and 2000 BC. Discovered in 1954, many presumed Monte d’Accoddi featured an altar, temple or step pyramid.