Dolmens!! Why did we Humans build them all over the planet 7-8000 years ago? Whats their purpose?

Dolmens!! Why did we Humans build them all over the planet 7-8000 years ago? Whats their purpose?
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Korea
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India
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Ireland
Dolmens!! Why did we Humans build them all over the planet 7-8000 years ago? Whats their purpose?
Dolmens!! Why did we Humans build them all over the planet 7-8000 years ago? Whats their purpose?
Dolmens!! Why did we Humans build them all over the planet 7-8000 years ago? Whats their purpose?
Dolmens!! Why did we Humans build them all over the planet 7-8000 years ago? Whats their purpose?
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