On Tuesday, journalists and English Heritage members were given a preview of the new center, which houses a 360-degree Cinerama-style "virtual tour" of the monument, along with an extensive exhibition about the Neolithic Britons who built Stonehenge starting 5,000 years ago.
When the building opens to the public on Wednesday, workers will dismantle the old ticket office and other nondescript structures clustered beside the monument. A busy road that ferried thousands of cars a day past the stones is being closed and grassed over.
The idea is to return Stonehenge, 80 miles (130 kilometers) southwest of London, to its rural landscape. Visitors will be bussed to the stones on a special shuttle. Or they can walk, exploring paths and an ancient processional approach route that for years has been cut in half by asphalt.
Even the new visitor building — two single-story blocks, one of glass and one of timber, under an undulating roof — is designed to fit unobtrusively into the landscape.
"If people don't remember it when they go home, but they remember the monument, that won't be a bad thing," said architect Stephen Quinlan.
Inside, the exhibition seeks to show the monument's prehistoric creators to be sophisticated people, who raised pigs and hunted, gathered from far and wide for feasts — and built this remarkable, mysterious monument.
The face of one 5,000-year-old local resident has been reconstructed from his skull by Oscar Nilsson, a forensic sculptor. He had good teeth and handsome features, in a shaggy, prehistoric kind of way.
"The women here at English Heritage are very fond of him," Nilsson said.
All this comes at a price.
The 27 million pound ($44 million) renovation was funded partly through donations and partly by a levy on profits of Britain's national lottery.
The admission charge has almost doubled, from 8 pounds ($13) to 14.90 pounds ($24) for an adult. There is the requisite modern cafeteria and a large gift shop, where visitors can buy Stonehenge jam, chocolate, baseball caps, mouse pads and fridge magnets, as well as "Stonehenge Rocks" T-shirts.
The commercialism is isolated from the monument, which retains its eternal mystery.
Stonehenge was built in three phases between 3000 B.C. and 1600 B.C. Archaeologists agree it was a temple — but to what gods, and exactly how it was used, remains unclear.
Recent research suggests the site may have started as a giant burial ground for elite families. Archaeologists have found the remains of dozens of cremated bodies from about 3000 B.C. whose location was marked by bluestones.