Deep in the woods sits this octagonal folly – with a real surprise inside. The ceiling and walls of the main room are festooned with shells, while in the basement is a cold plunge pool.

Listed Grade II*, the dairy was conceived to represent a tiny Italianate chapel topped with a bell tower, and with four corner pavilions.

Houghton West Lodge is one of four houses that guard the approaches to Houghton Hall,  one of England’s finest Palladian houses and once home to Britain's first Prime Minister.

The tower was built as a folly in 1821 with a pretty sitting room on the first floor. The third floor was added in 1943 by the Germans as an observation point, with views in every direction.

The Summerhouse stands in beautiful woodland on the Shuttleworth Estate. The outstandingly fine brickwork of this foursquare folly is likely to date from the early 18th century.

This beautiful little pavilion has two distinct faces and has a breath-taking panorama. Approached from the wood, this rustic cottage with a thatched roof houses an elegant interior.

45a Cloth Fair is a fine Georgian house close to Smithfield Market.  It is an oasis of relative calm in central London.

William Beckford designed Beckford’s Tower in the 1820s as his museum and treasure house. Today the Tower recreates the flavour of Beckford’s extravagant and sumptuous interiors.

Brinkburn Mill sits next to the River Coquet at the bottom of a thickly-wooded valley. A mill has been on this site since medieval times, with the present building dating to about 1800.

Situated in the rolling landscape behind Hadrian’s Wall, Causeway House was built in 1770 as a farmhouse. Causeway remains the only house in Northumberland still thatched in heather.

This gatehouse is all that is left of Cawood Castle, once a stronghold of the Archbishops of York. It was here that Cardinal Wolsey was arrested for treason on King Henry VIII’s orders in 1530.

This octagonal castellated Gothic tower was built in 1839 by Lady Rolle as a birthday present for her husband. It sits atop a pocket of countryside, surrounded by heathland and pretty villages.

Church Cottage was the very first Landmark acquired by Sir John Smith in 1965. A Victorian cottage,it is cosy accommodation in a beautiful part of Wales.

This 18th-century tower gives striking views of the historic market town of Richmond. Inside, three single octagonal rooms are decorated in an elaborate cocktail of classical and Gothic styles.

The building now known as Fox Hall was built in 1730 for the 2nd Duke of Richmond.  Its magnificent room upstairs has been described as “a sequin in an ordinary world”.