Castle Leslie, Victorian estate in Glaslough, Ireland

Castle Leslie is a Scottish baronial country house of grey-brown stone with multiple gables, tall chimneys and dark slate roofs, built in 1870 to designs by Lanyon, Lynn and Lanyon for Sir John Leslie, 1st Baronet. Its taller central gable holds a mullioned window above a recessed arched entrance, with lower wings to either side. It stands on the 1,000-acre estate beside Glaslough, 11 km northeast of Monaghan town.

A 17th-century Leslie mansion stood at Glaslough until much of it was demolished by Sir John Leslie in the 19th century; Jonathan Swift had stayed there and mocked its shelves of books 'written by Leslies all about themselves'. The present castle, designed by Lanyon, Lynn and Lanyon, was built in 1870 for Sir John Leslie, 1st Baronet, MP, on the site of an earlier castle and never had a defensive purpose.

The village of Glaslough takes its name from the estate's largest lake, Glas Loch, Irish for Green Lake. The family church on the grounds, where Paul McCartney married Heather Mills in 2002, hosted the wedding banquet for 300 guests prepared by then executive chef Noel McMeel. A riding centre returned to the estate in 2004 with new stables and trails.

The estate sits about an hour and a half from Dublin and one hour from Belfast by car, making it accessible from either city. The grounds are well-marked and mostly flat, making them straightforward to walk around.

The Renaissance-style cloister at the rear of the house links the main building to a single-storey wing holding the Library and Billiard Room. It is said to imitate Michelangelo's cloister at Santa Maria degli Angeli e dei Martiri in Rome, and it contrasts with W. H. Lynn's austere exterior.