Greater than 30 employees at Hillsborough Fort in County Down are to be made redundant.
The 100-acre web site is run by Historic Royal Palaces and is the official NI residence of the Queen.
The charity mentioned that like many vacationer sights, it had been badly affected by the coronavirus pandemic.
Thirty-three full-time posts are to go and Historic Royal Palaces has began a session course of, having “exhausted all different choices”.
It mentioned it regretted making the redundancies, however wanted to behave to maintain its long-term future.
Hillsborough Fort reopened to the general public in 2019 following a £24m refurbishment, which took 5 years.
Nevertheless, the venue needed to shut throughout lockdown, which it mentioned had led to a big shortfall in its funds.
Whereas the charity had furloughed employees, it mentioned it was now consuming into its reserves and anticipated to exhaust these by the top of the 12 months.
The pinnacle of Hillsborough Fort, Laura McCorry, mentioned the downturn in guests and worldwide tourism had been devastating.
“This can be a troublesome time for the tourism trade and we’re decided to play our half in its restoration,” she mentioned.
“It’s a matter of huge remorse that we will solely accomplish that if we act now to scale back our payroll prices and make the citadel financially sustainable.”