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:

Friday's Kfm Obituary Announcements
New Cultural Programme Set For Castletown House
Celbridge Woman Who Lost Sister To CF Calls For People To Support Today's Fundraiser
Protestors, Including Kildare's John Dallon, Refused Entry From Government And Agriculture Bodies Meeting
Defence Forces Travelling To The Curragh Today For Training
Newbridge Silverware’s Silver-plated Cutlery Factory Officially Closes
Martin Heydon Will Meet Farming And Haulier Groups This Morning Amid Fuel Protests
Missing 17-Year-Old Joshua Treacy From Maynooth Has Been Located