Ireland, County Sligo, Castlebaldwin, Carrowkeel Megalithic Cemetery, Facade of one of the cairns known as Cairn H with entrance doorway visible..

Ireland, County Sligo, Castlebaldwin, Carrowkeel Megalithic Cemetery.

Ireland, County Sligo, Castlebaldwin, Carrowkeel Megalithic Cemetery, View from the summit over one of the cairns..

Ireland, County Sligo, Castlebaldwin, Carrowkeel Megalithic Cemetery, View from the summit over two of the cairns..

Republic of Ireland, County Wexford, Ferrycarrig, Irish National Heritage Park, Ring Fort, General view from the interior.

Republic of Ireland, County Wexford, Ferrycarrig, Irish National Heritage Park, Ring Fort entrance.

Republic of Ireland, County Wexford, Ferrycarrig, Irish National Heritage Park, Ring Fort entrance.

Republic of Ireland, County Wexford, Ferrycarrig, Irish National Heritage Park, Neolithic or New Stone Age Farmstead.

Republic of Ireland, County Wexford, Ferrycarrig, Irish National Heritage Park, Middle Stone Age or Mesolithic Camp Site.

Republic of Ireland, County Wexford, Ferrycarrig, Irish National Heritage Park, Middle Stone Age or Mesolithic Camp Site.

Guatemala, Solola Department, San Pedro la Laguna, 90 year old Mayan man in traditional dress stands in front of his home.

Israel, A model of the ancient Canaanite gate, called Abraham's Gate, in front of the real gate in the ruins of the Old Testament city of Dan in the Tel Dan Nature Reserve in Galilee in northern Israe...