Stonehenge : Michelin's recommendations
Radio-carbon dating has shown that the building of Stonehenge began in 2950 BC and finished in 1500 BC. In the context of other similar engineering feats, the Great Pyramid of Egypt was built around 2500 BC, the Great Wall of China around 1000 BC, the Aztec constructions of Mexico between 500 and 1000 AD and the figures on Easter Island between 400 and 1200 AD. In the first phase, c 2950-2900 BC, a ditch with an inner bank of chalk rubble 2m high was dug. Within this was a ring of 56 postholes, known as the Aubrey Holes. To the northeast, the bank and ditch were breached to make an entrance, marked on the outside by the Heel Stone. Inside the enclosure, four limestone Station Sarsens were set up at the cardinal points of the compass. Around 2100 BC, a double ring of bluestones, weighing up to 4 tons each, were erected in the centre. A century later, these were replaced by tall trilithons (standing stones surmounted by lintels). Inside this circle, five separate giant trilithons were erected in a horseshoe. Today, only the Slaughter Stone, sadly fallen, now remains. Around 1500 BC, the dressed bluestones were reintroduced into their present horseshoe formation. The main axis of the structure is aligned with the rising sun on midsummer's day, a fact which has further contributed to fuelling the debate as to the monument's original purpose. However, whether it was for sun worshipping or an astronomical observatory, it was clearly not built by the Druid peoples who only settled in Britain around 250 BC.