Downhill Castle, built in the 18th century, was the Earl-Bishop of Derry's palace. It is set in extensive landscaped grounds containing lakes, ornamental gardens and neoclassical buildings. The most famous landmark of the castle is the eccentric Earl of Bristol and Bishop of Derry Frederick Hervey's library known as the Mussenden Temple. The Temple of Vista in Rome was the inspiration for this classical temple which has a domed rotunda and sits perched on a cliff providing breathtaking view of Downhill strand.

Prices:
Gift Aid Admission(Standard): £2.50 (£2.27), child £1.70 (£1.54), family £6.70 (£6.08). Groups (£2.10)

Opening times:
Grounds; All year, dawn to dusk.
Facilities; 28 Mar–4 Oct 09, 10–17.

Location:
Mussenden Road, Castlerock, Co. Londonderry.