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.

The Chapel is a tiny grey granite building in the rural hamlet of Lettaford, a settlement on the edge of Dartmoor that has been lived in since at least 1300.

This very clever scale model of a French chateau sits on a hill above the River Trent in the middle of the Lincolnshire countryside.

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.

A tiny, circular tower standing on the boundary of a cricket pitch, Prospect Tower was built around 1808. Approached along an avenue of walnut trees, Lord Harris called it his “whim.”

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.

A Georgian folly within an outstanding Picturesque garden, the Ruin was built in about 1766. On the edge of a steep wooded gorge, it was one of several buildings scattered across the gardens.

This simple and evocative cottage, from around 1840, was built to serve one of the monumental pumping engines that sprang up as the Steam Age took on the challenge of draining the Fenland.

This tiny pavilion was a majestic grandstand for the enclosure in front. It is a mature expression in miniature of all that was best in Tudor and Jacobean architecture.

Originally a geological shop and museum, the Egyptian House in Penzance is a rare survivor of Egyptian-style architecture. This first floor apartment is one of three.

Mill House dates from 1700 and is mainly built of stone with a thatched and slated roof. No. 1 is the slightly larger of two cottages and has a wide fireplace in the sitting room.

Designed and constructed by James Mansergh and Robert Rawlinson, work began on Appleton Water Tower in 1877 to provide a clean water supply to the Sandringham Estate.

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.

There can be no more romantic, remote or secluded cottage in Cornwall than this one, named after the creek on the Helford River near which it stands down a track in deep woodland.

Freston Tower is a six-storey Tudor folly that looks out over the River Orwell. There is a single room on each floor with the sitting room at the top to take advantage of the unrivalled views.