Mysterious Monuments: Stonehenge, U.K.
Surrounded by several hundred burial mounds and located far from the source of its megalithic stones, Stonehenge is the poster child of mysterious monuments. The earth and ditch around the monument dates to 3100 BC, and while there is some disagreement on the precise date of the erection of the stones, that followed roughly between 2500 BC to 2200 BC. There are several theories as to the purpose of the site, and it is likely that there were multiple uses over the years. Astronomical, spiritual, ancestor worship all have proponents and some have offered the idea that it was a sort of healing place, based on the conditions of the bodies buried around it.