Admission to Office of Public Works managed heritage sites will be free on the first Wednesday of every month in 2011, beginning this month.
The initiative hopes to encourage more national and international people to visit the sites and to stimulate interest in the heritage of the country.
Minister of State with Responsibility for the Office of Public Works Brian Hayes has urged the public to take advantage of the opportunity.
Access to many sites is already free, but for some sites such as Kilmainham Gaol, Kilkenny Castle and Newgrange adult visitors pay a fee of between €3-€11 each.
Muckross House & Gardens, Muckross Traditional Farms and Glenveagh Castle are excluded from the scheme.
Sites free of charge, or free on specified dates:
Rock of Cashel, Co Tipperary
Skelligs, Co Kerry
Garden of Remembrance, Dublin
Hill of Tara, Co Meath
Newgrange, Co Meath
Arás an Uachtaráin, Dublin
Desmond Castle (French Prison)
Ilnacullin (Garinish Island)
Glebe House and Gallery
The Casino, Marino
Dublin Castle, State Apartments
Portumna Castle and Gardens
Patrick Pearse's Cottage (Teach an Phiarsaigh)
Derrynane House, National Historic Park
Ionad an Bhlascaoid Mhóir, The Blascaod Centre
Old Mellifont Abbey
Battle of the Boyne – Oldbridge Estate
Brú na Bóinne Visitor Centre (Newgrange) Knowth Open Easter to Late October
Hill of Tara
Carrowmore Megalithic Cemetery
Rock of Cashel
Roscrea Heritage (Castle and Damer House) and the Blackmills
John F Kennedy Arboretum
Glendalough Visitor Centre
More information at www.heritageireland.ie