Its part of government plans to encourage domestic tourism.
Visiting Office of Public Works heritage sites, including Castletown House in Celbridge, will be free for the rest of the year.
The Junior Minister with responsibility for the OPW has announced the step to remove fees takes effect immediately.
It's part of the Government's recovery plan after inter-county travel resumed and museums and galleries opened earlier this week.
Minister Patrick O'Donovan is encouraging people to holiday at home this summer
Minster O'Donovan is appealing to people when they visit sites to boost local economies:

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Uisce Éireann Announce Progression Of Projects In Kildare
Homelessness Figures In Kildare Drop Slightly In Month Of April
President Connolly Reopens Round Tower In Kildare Town
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Ballyshannon National School Celebrates 125 Years
Update Given On Planned Second Bridge In Newbridge
Defence Minister Gives Update On Management Of Curragh Plains