The pool, found in northern Italy, made people feel as if they were being transported to another realm, leading researchers to compare it to Stonehenge.
The salt production facility found in North Yorkshire predates Stonehenge, and is the oldest found in Britain, and possibly even Western Europe.
The sarsens were erected at Stonehenge around 2500 BC. The largest stands 30 feet (9.1 meters) tall. The heaviest weighs about 30 tons.
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