Downhill Demesne, sometimes called Downhill House, is an 18th-century mansion built by the eccentric Earl-Bishop, set within open grounds on the north coast - genuinely one of the most spectacular day-trip destinations on the Causeway Coast. Bring a picnic, explore Hezlett House’s sheltered gardens, take in Mussenden Temple, and walk the windswept cliff-top paths.
The Setting
Set on open, wide grassland overlooking Downhill Beach and Castlerock, the grounds occupy the whole top of the hill above the ocean - a dramatic, exposed, genuinely memorable spot.
Woodlands and Gardens
The estate is studded with woodland, including rare tree species, with walks through the Black Glen on a well-surfaced path, and a steeper grass track from the Bishop’s Gate entrance. The walled garden, near the Lion’s Gate car park, is sometimes called the Bishop’s Gate Gardens.
Exploring the House
Much of the demesne is a roofless, sprawling ruin, largely accessible on foot. The main entrance leads through the lounge into the hall, with sightlines along the stableyard between the east and west yards toward Mussenden Temple. The Boudoir, Breakfast Room, Drawing Room, and Dining Room are mostly intact; the galleries are genuinely imposing. Stables, a kitchen, and offices line the south and eastern stableyard walls - not all areas are accessible. A mown grass track around the manor house offers wheelchair access through the north portcullis; the Bishop’s Gate entrance avoids the few entry stairs.
The Earl-Bishop
Confirmed history: Downhill House was commissioned by Frederick Hervey, 4th Earl of Bristol - known as the Earl-Bishop, having also served as Bishop of Cloyne and, from 1768, Bishop of Derry. Construction began in 1775, his first Irish building project. He was notorious for starting more architectural projects than he finished - his second Irish house, on Lough Beg, was dismantled unfinished.
A fire in 1851 destroyed most of the main house, sparing only the east wing; it was rebuilt between 1873 and 1876 to a design by John Lanyon, who added a new entrance beneath the Gallery on the west side. The National Trust acquired the site in 1980, making it safe for public access.
Mussenden Temple
Standing apart from the manor house at the cliff edge, Mussenden Temple is visible from within the house through the East and West Yard gates, and reachable via a sealed path - take care near children given the cliff height. A small wall west of the Temple offers views over Downhill Beach and the railway line toward Derry/Londonderry. The surrounding fields are grazed, so keep to marked paths.
Downhill Beach
A gorgeous golden sandy beach with dune systems, accessible west of the estate on foot or by car (the walk back up is genuinely strenuous - driving down is the easier option). This Blue Flag beach is one of Ireland’s longest, stretching to Lough Foyle at Magilligan Point, separated from Benone Strand by the Umbra Burn.
