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Most of the present structure dates from around 1620 when Sir Laurence Parsons was granted the estate.
A later Laurence presided over alterations to the castle in the early 19th century, which left it almost exactly as you see it todayThe internal parts of the Castle are private and are home to The Earl of Rosse and his family.
However, the grounds and stunning gardens are open to the public.
The award winning gardens are the largest in country, spanning over 120 acres of beauty and tranquility.
This impressive plant collection boasts rare species from around the world, including over 40 champion trees of the British Isles.
The millennium gardens reflect a French-style formal garden, and include exclusive plants to the Demesne that you will not find anywhere else.
Walk through the worlds tallest box hedges and into an intimate courtyard embracing a spectacular Wisteria.
Cross over a breathtaking waterfall in the fernery, and meander around rivers and lakes while trying to catch a glimpse of the elegant swans.
After exploring the natural and botanical marvels, travel back in time to when Birr was a hub of scientific discovery and innovation at Irelands Historic Science Centre.
The interactive museum reveals the wonders of early photography, engineering, and astronomy, with a special emphasis on the brilliant design and assembly of the Great Telescope, a Leviathan created by the Third Earl of Rosse in the 1840s right here on the castle grounds.
The telescope has been fully restored and sits in the centre of the Demesne to be viewed by all who visit.
After taking in all of the wonders Birr Castle Demesne has to offer, unwind with a hot cup of tea or coffee in the signature Courtyard Cafe, which prepares delicious sandwiches, homemade soup, salads, desserts and daily lunch specials.