Unknown, Stonehenge, ca. 2550 - 1600 BCE Megalithic structure, meaning big stone  Circle is 97

Unknown,Stonehenge, ca. 2550 - 1600 BCE

• Megalithic structure, meaning big stone 
• Circle is 97’ in diameter, trilithons 24’ high  
• a ‘henge’ is arrangement of mega stones in a circle + surrounded by a ditch  
• inside rings are 'blue stone’ and surround a horse shoe  
• includes a 'heel stone’ - a marking stone, marks the spot where the sun rose in the summer solstice; stonehenge is an astronomical observatory, and is remarkably accurate to solar calendar  
• not sure how they got there since their weight is tremendous; the stones are from Wales