History buffs can peek under the floors and beneath the eaves of the oldest surviving homestead in the country this Saturday.
Visitors will be given an "access-all-areas" look at the four-decade architectural transformation of Elizabeth Farm built in 1793 by wool pioneers John and Elizabeth Macarthur.
The open day is part of the Sydney Architecture Festival which will run a full day of events in Parramatta for the first time.
Curators, gardeners and experts will peel back the layers of Elizabeth Farm which had been transformed from a small cottage to a substantial colonial regency homestead by 1820.
Sydney Living Museums director Mark Goggin said: "As the first distinguished house built in early colonial times the site represents the beginnings of one of Sydney's largest flourishing urban areas."
Visitors can taste pickled and preserved treats from the underground cellar, use a quill pen and ink in the courtyard, put on a colonial costume and take a look inside an authentic colonial kitchen.
The program includes a guided mini-bus tour of Granville, free consultations with an architect and an open day at Parramatta Park's George Street Gatehouse. A panel of experts will explore the relationship between heritage conservation, sustainability and architectural design in talks at the Riverside Theatre courtyard.