The return of the documentary following the restorations of historic buildings, beginning with Russborough House in Co Wicklow, home to a famed art collection

The restoration of Johnstown Castle in Co Wexford, a stunning example of the Gothic revival architecture of the 19th century. The programme follows curator Matt Wheeler and his team as they piece together the castle's 800-year history and bring it into the 21st century

The restoration of Castletown House in Co Kildare, where Mary Heffernan and a team of experts are delving into the history of original owner William “Speaker” Conolly’s family while overseeing the return of several paintings and artefacts that have been missing for decades.

Strokestown House, Co Roscommon: The restoration of Strokestown House in Co Roscommon, which served as the Pakenham-Mahons’ seat and was the site of mass evictions and murders during the Great Famine, with the family’s head being assassinated in retaliation for his cruel treatment of tenants. Curator John O’Driscoll and his team must upgrade the house’s heating system in order to preserve the house’s priceless archive of famine records.

A look at how Mary Heffernan's team is working to conserve, update and reinvigorate the visitor experience at Kilkenny Castle, one of Ireland's most beautiful buildings

Once a Dublin residence of the fabled Guinness family, Farmleigh, just on the outskirts of Dublin’s Phoenix Park, is the official Irish state guesthouse. The maintenance and efficient running of the house is of paramount importance to the state, and it is one of the finest houses in the care of the OPW. This year, Mary Heffernan of the OPW and her team are gearing up for one of their busiest seasons yet.

Glebe House and Gallery in Co. Donegal was the home of the renowned artist Derek Hill. He lived there for 30 years, moving to rural Donegal to escape the hustle and bustle of London and reconnect with his painting. Now under the care of the OPW, Glebe’s curator and director, Adrian Kelly brings us on a journey through the artist’s extensive collection. We will also explore how Hill’s work inspires fellow artists to this day, and have a look at the influence he had on the local Tory Island.