There are neolithic burial mounds scattered all around Wales, but many have been completely stripped of their earthen covering by overenthusiastic archaeologists. What makes Bryn Celli Ddu fascinating is that it's relatively intact – you can enter the grass-covered barrow and pass into a stone-lined burial chamber, complete with original megalithic zigzag carvings, that was used as a communal grave 5000 years ago.
To find it, follow the signpost off the A4080 down a country lane.
