Sligo is home to roughly one-third of Ireland's neolithic monuments.
Over 130 monuments and buildings were scanned and brought together at www.3dicons.ie.
Six prehistoric sites in Ireland could be granted World Heritage Site status next year.
Most tourists, both Irish and international, will be unfamiliar with Rathcroghan in County Roscommon, but it used to be Ireland's ancient royal capital.
The discovery of a burial site near Newgrange caused quite a stir in 2018.
Viewers were treated to a spectacular site on Sunday as the passage tomb filled with light at dawn.
As sunlight hits the back of this Neolithic passage tomb every year it's as though our ancestors of 5,000 years ago are reaching out to us.
An ancient circular enclosure was recently discovered near Newgrange, Co Meath.
A research team at Trinity College found evidence of Down's Syndrome in the remains of a baby thought to be 6,000 years old.
An in-depth survey revealed the importance of the Hill of Tara to our Irish ancestors.
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