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Stonehenge construction start in 3000bc but was completed in 2500bc about 5000 years ago

Stonehenge is believed to be built by the Druids, made for sacrificial ceremonies.

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Stonehenge's Multiphase Construction

Archaeologists believe England most iconic prehistoric ruin was built in several stages, with the earliest constructed 5,000 or more years ago. First, Neolithic Britons used primitive tools-possibly made from deer antlers-to dig a massive circular ditch and bank, or henge, on Salisbury Plain. Deep pits dating back to that era and located within the circle-known as Aubrey holes after John Aubrey, the 17th-century antiquarian who discovered them-may have once held a ring of timber posts, according to some scholars.

Did you know? In 1620, George Villiers, 1st Duke of Buckingham, dug a large hole in the ground at the center of Stonehenge looking for buried treasure.

Several hundred years later, it is thought, Stonehenge's builders hoisted an estimated 80 non-indigenous bluestones, 43 of which remain today, into standing positions and placed them in either a horseshoe or circular formation.

During the third phase of construction, which took place around 2000 B.C., sarsen sandstone slabs were arranged into an outer crescent or ring; some were assembled into the iconic three-pieced structures called trilithons that stand tall in the center of Stonehenge. Some 50 sarsen stones are now visible on the site, which may once have contained many more. Radiocarbon dating suggests that work continued at Stonehenge until roughly 1600 B.C., with the bluestones in particularly being repositioned multiple times.

The Megaliths of Stonehenge

Stonehenge's sarsens, of which the largest weighs more than 40 tons and rises 24 feet, were likely sourced from quarries 25 miles north of Salisbury Plain and transported with the help of sledges and ropes; they may even have already been scattered in the immediate vicinity when the monument's Neolithic architects first broke ground there.

The smaller bluestones, on the other hand, have been traced all the way to the Preseli Hills in Wales, some 200 miles away from Stonehenge. How, then, did prehistoric builders without sophisticated tools or engineering haul these boulders, which weigh up to 4 tons, over such a great distance?

According to one longstanding theory, Stonehenge's builders fashioned sledges and rollers out of tree trunks to lug the bluestones from the Preseli Hills. They then transferred the boulders onto rafts and floated them first along the Welsh coast and then up the River Avon toward Salisbury Plain; alternatively, they may have towed each stone with a fleet of vessels. More recent hypotheses have them transporting the bluestones with supersized wicker baskets or a combination of ball bearings, long grooved planks and teams of oxen.

As early as the 1970s, geologists have been adding their voices to the debate over how Stonehenge came into being. Challenging the classic image of industrious Neolithic builders pushing, carting, rolling or hauling the craggy bluestones from faraway Wales, some scientists have suggested that glaciers, not humans, did most of the heavy lifting.

The globe is dotted with giant rocks known as glacial erratics that were carried over long distances by moving ice floes. Perhaps Stonehenge's mammoth slabs were snatched from the Preseli Hills by glaciers during one of the Ice Ages and deposited a stone's throw away-at least comparatively-from Salisbury Plain. Most archaeologists have remained cool toward the glacial theory, however, wondering how the forces of nature could possibly have delivered the exact number of stones needed to complete the circle.

Who Built Stonehenge?

According to the 12th-century writer Geoffrey of Monmouth, whose tale of King Arthur and mythical account of English history were considered factual well into the Middle Ages, Stonehenge is the handiwork of the wizard Merlin. In the mid-fifth century, the story goes, hundreds of British nobles were slaughtered by the Saxons and buried on Salisbury Plain.

Hoping to erect a memorial to his fallen subjects, King Aureoles Ambrosias sent an army to Ireland to retrieve a stone circle known as the Giants' Ring, which ancient giants had built from magical African bluestones. The soldiers successfully defeated the Irish but failed to move the stones, so Merlin used his sorcery to spirit them across the sea and arrange them above the mass grave. Legend has it that Ambrosias and his brother Uther, King Arthur's father, are buried there as well.

While many believed Monmouth's account to be the true story of Stonehenge's creation for centuries, the monument's construction predates Merlin-or, at least, the real-life figures who are said to have inspired him-by several thousand years. Other early hypotheses attributed its building to the Saxons, Danes, Romans, Greeks or Egyptians.

In the 17th century, archaeologist John Aubrey made the claim that Stonehenge was the work of the Celtic high priests known as the Druids, a theory widely popularized by the antiquarian William Stukeley, who had unearthed primitive graves at the site. Even today, people who identify as modern Druids continue to gather at Stonehenge for the summer solstice. However, in the mid-20th century, radiocarbon dating demonstrated that Stonehenge stood more than 1,000 years before the Celts inhabited the region, eliminating the ancient Druids from the running.

Many modern historians and archaeologists now agree that several distinct tribes of people contributed to Stonehenge, each undertaking a different phase of its construction. Bones, tools and other artifacts found on the site seem to support this hypothesis. The first stage was achieved by Neolithic agrarians who were likely indigenous to the British Isles. Later, it is believed, groups with advanced tools and a more communal way of life left their stamp on the site. Some have suggested that they were immigrants from the European continent, but many scientists think they were native Britons descended from the original builders.

Stonehenge's Function and Significance

If the facts surrounding the architects and construction of Stonehenge remain shadowy at best, the purpose of the arresting monument is even more of a mystery. While historians agree that it was a place of great importance for over 1,000 years, we may never know what drew early Britons to Salisbury Plain and inspired them to continue developing it.

There is strong archaeological evidence that Stonehenge was used as a burial site, at least for part of its long history, but most scholars believe it served other functions as well-either as a ceremonial site, a religious pilgrimage destination, a final resting place for royalty or a memorial erected to honor and perhaps spiritually connect with distant ancestors.

In the 1960s, the astronomer Gerald Hawkins suggested that the cluster of megalithic stones operated as an astronomical calendar, with different points corresponding to astrological phenomena such as solstices, equinoxes and eclipses. While his theory has received quite a bit of attention over the years, critics maintain that Stonehenge's builders probably lacked the knowledge necessary to predict such events or that England's dense cloud cover would have obscured their view of the skies.

More recently, signs of illness and injury in the human remains unearthed at Stonehenge led a group of British archaeologists to speculate that it was considered a place of healing, perhaps because bluestones were thought to have curative powers.

Stonehenge Today

One of the most famous and recognizable sites in the world, Stonehenge draws more than 800,000 tourists a year, many of whom also visit the region's numerous other Neolithic and Bronze Age marvels. In 1986 Stonehenge was added to UNESCO's register of World Heritage sites in a co-listing with Avebury, a Neolithic henge located 17 miles away that is older and larger than its more famous neighbor.

Stonehenge has undergone several restorations over the years, and some of its boulders have been set in concrete to prevent collapse. Meanwhile, archaeological excavations and development of the surrounding area to facilitate tourism have turned up other significant sites nearby, including other henges.

Fact Check

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Stonehenge is a prehistoric monument that took Neolithic builders an estimated 1,500 years to erect. Located in southern England, it is comprised of roughly 100 massive upright stones placed in a circular layout.

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Born- 190 BC in Nicaea, Greece

Hipparchus was a Greek astronomer. He was most commonly known for being the founder of trigonometry. He also measured the earth-moon distance accurately.

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Born- 100 AD, in Alexandria, Egypt

Ptolemy who was a astronomer, gerographer, astrologer, and mathematician who wrote many scientific treatises. He was most known for his belief that the Earth was the clear center of the universe in which everything revolved around.

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Born- February 19, 1473 in Torun, Poland.

Copernicus was a mathematician, astronomer, and catholic clergyman during the Renaissance-era. One of his many theories placed the sun at the middle of the universe instead of the Earth being at the middle. He proposed a heliocentric system.

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Born- December 14, 1546 in Knutstorp Manor, Sweden.

Brahe was an astronomer known for many accurate astronomical observations. He was known for inveting many astronomical instruments used in measuring and fixing the positions of the stars. Brahe's assistant was Kepler who was also a well known astronomer.

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Galileo was born on February 15, 1564 in Pisa, Italy.

Galileo was known for being an obvservational Astrologists. One of his most known discoveries where the four most massive jupiter moons.

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Kepler, born on December 27, 1571 in  Weil der Stadt, Germany.

Kepler was an astrologists who discovered the three laws oof planetary motion which desribe the motion of planets around the sun.

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Invented in 1609, in Italy.

The telescope was invented and improved by Galileo as he heard about the dutch perspective glasses and within his own knowledge he invented an improved telescope that could magnify objects by 20 times.

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Born- January 4, 1643 at the Woolsthorpe house in the United Kingdom.
Newton was an astronomer, mathematician, author, and physicist.

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Born- March 14, 1879 in Ulm, Germany
Albert Einstein was a theoretical physicist. Some of his great works was the quantum theory of light.

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Born- January 8, 1942 in Oxford, UK
Stephen Hawking was a theoretical physicist and cosmologists. Hawking was an important person as he discovered that the theory of the big bang theory must have started from a singularity.