You can clearly see how later Irish and British barrows evolved from barrows like this.
Image credit: Wikipedia
Images
An aerial photograph of the barrows.
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Another shot of the ring barrow
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A shot of the ring barrow, remarkably similar to many Irish barrows I’ve seen.
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A shot of the ring and mound barrow
Image credit: Wikipedia
Articles
This site contains the only continental Ring-Barrow with a clearly defined inner mound bank and fosse that I know of. It is dated to ~2600bc and was built by members of the Beaker people, the same people who would invade Ireland and Britain in short succession after this barrow was built. It’s my theory that barrows like this are directly ancestral to the barrows that would later dot the Irish and British countrysides!