Carrowkeel Passage Tombs, which date from 3200-2400 BC, County Sligo, Ireland.

- Image ID: C3EB2P
Carrowkeel Passage Tombs, which date from 3200-2400 BC, County Sligo, Ireland.
Gareth McCormack / Alamy Stock Photo
Image ID: C3EB2P
Location: County Sligo, Ireland