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