Imagine you're walking across a wide, grassy field in the early morning.

Mist swirls around you and ahead.

Giant stones rise from the earth, towering high like giants frozen in place.

You step closer and run your fingers along the cool, rough surface.

These stones have been standing for thousands of years, long before cars, airplanes,

and even before people built cities. You're looking at Stonehenge, one of the most amazing

and mysterious structures in the world. Stonehenge is a prehistoric monument in the country of England.

It was built a very long time ago, over 4,000 years ago.

That means it's even older than the pyramids in Egypt. Stonehenge sits on a plane called Salisbury Plain in the south of England.

People from all over the world travel to see this circle of stones because no one is completely sure why it was built,

or how people moved such huge stones without machines. The first part of Stonehenge was

started around 3,100 BCE. That's about 5,000 years ago. At first, people dug a big circular ditch

and used the chalky white soil to make a raised bank.

This was the earliest stage of the monument.

Later they began bringing in large stones, some weighing as much as a truck, and standing them upright in a big circle.

There are two main types of stones at Stonehenge. The larger ones are called

Sarsons and the smaller ones are called blue stones. The Sarsons are so heavy, some weigh more than

25 tons, that people still wonder how they were moved from many miles away. Most scientists

believe that the builders used wooden sledges,

rollers, and ropes to move the giant stones across the land. It may have taken hundreds

of people working together just to move one stone. The blue stones are another mystery.

These smaller stones came from a mountain range in Wales, more than 100 miles away.

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