Stonehenge has always been a mystery and even now, although there are a lot of theories and speculations, scientists could not figure out its true purpose, who and how build it. There are a lot of great facts about it, and below, I have shared 10 of the most interesting. 1. Its construction took 1500 years. The oldest elements date back to around 3000 BC, when a ditch 6 feet deep was dug in a field to form a circular enclosure. The first stones started appearing around 2500 BC, with a refresh of rearranging of bluestones and digging of additional holes has continued until around 1500 BC. 2. It is made of exotic materials. Within Stonehenge, there are two main types of stones. The large verticals and arches are made of sarsen, a type of sandstone that is common in the region. The smaller stones are known as bluestones. They are not actually blue, but have…