The Passage grave reference article from the English Wikipedia on 24-Apr-2004
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Passage grave

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A Passage grave (sometimes hyphenated) or Passage tomb is a tomb, usually dating to the Neolithic, where the burial -- or burials -- are reached along a -- usually low -- passage. The name usually refers to a considerable subgroup of the Chambered cairns, but there are earthen Barrows which are effectively passage-graves as well.

Passage graves were usually constructed at the tops of hills or mountains, so that they could be seen from a great distance.

Examples of Passage Graves: