Final answer:
The blue stones of Stonehenge are noteworthy for their distant origin, the sophisticated ancient transportation methods used to bring them to the site, and their role in the monument's astronomical functions.
Step-by-step explanation:
The blue stones of Stonehenge are fascinating for several reasons. Firstly, they are distinctive because they appear blue when wet and come from the Prescelli Mountains in southwest Wales, which is about 150 miles away from Stonehenge.
The transport and construction of these stones were accomplished without the wheel, using a sophisticated system of transport involving felled tree and earthen mounds. Secondly, these stones were added to the site around 2300 BCE and each stone weighs between two to four tons. Lastly, their source being over 250 kilometers away from the construction site adds to the mystery and significance of these stones in the prehistoric monument.
Moreover, Stonehenge itself is believed to have been used to track the motions of the Sun and Moon, as suggested by the alignment of certain stones like the Heel Stone with the summer solstice sunrise. This prehistoric monument, constructed in phases from 3000 to 1000 BC, showcases not only the remarkable engineering skills of the Neolithic people but also their astronomical knowledge and societal coordination.