The site consists of an 20.4 metre long passage chamber covered by a 12.2 metre high
earth mound. The site was first excavated in 1925 by the
Société Jersiaise. Fragments of twenty vase supports were found along with the scattered remains of at least eight individuals.
Gravegoods, mostly pottery, were also present. At some time in the past, the site had evidently been entered and ransacked. On top of the mound were built two Medieval chapels. The
Channel Islands have five
passage graves with side chambers (La Hougue Bie,
La Pouquelaye de Faldouet and
Grantez in Jersey,
La Varde and
Le Déhus in
Guernsey). La Hougue Bie is a
Neolithic ritual site which was in use around 4000-3500 BC. In
Western Europe, it is one of the largest and best preserved
passage graves and the most impressive and best preserved monument of Armorican Passage Grave group. Although they are termed "passage graves", they were ceremonial sites, whose function was more similar to
churches or
cathedrals, where burials were incidental. Since the excavations and restoration of the original entrance of the passage observations from inside the tomb at sunrise on the
March equinox (spring equinox) and the
September equinox (autumn equinox) have revealed that the orientation of the passage, probably fortuitously, allows the sun's rays to shine through to the chamber entering the back recess of the terminal cell. Although many passage graves showed evidence of continued activity into the
Late Neolithic period, La Hougue Bie was abandoned before that time. ==Chapels and Prince's Tower==