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.

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

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 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 surviving cross-wing of a late-medieval timber-framed hall-house in a peaceful woodland clearing in the Kent Weald.

Villa dei Vescovi is a Renaissance villa nestled in the vineyards and orchards of the Euganean Hills. One of two rooftop apartments, with views of the elegant orchards.

Villa dei Vescovi is a Renaissance villa nestled in the vineyards and orchards of the Euganean Hills. One of two rooftop apartments, with views of the elegant orchards.

Plas Uchaf is a substantial hall-house built in about 1400 and situated in the Dee valley, an area filled with scenery, wildlife and history. Few houses of this age survive in Wales.

From the time the Priest’s House was built around 1500, it played a central part in community life as both a village hall and local inn, hosting visitors and village feasts on saints’ days.

A banqueting house for Old Campden House built in 1613 by wealthy merchant Sir Baptist Hicks. The house burned during the Civil War, but its Banqueting Houses survive.

No. 2 is the slightly larger of a pair of stone, cob and thatched cottages, named after the Vicar of Morwenstow, who lived here in the 1820s.

The Grammatica Britannica was written in this 16th-century manor house in 1593, making it the possible birthplace of the modern Welsh language.

Wolveton Gatehouse was completed during the reign of Henry VIII and was the gatehouse of probably one of Dorset’s finest medieval houses, the Elizabethan part of which is still a family home.

Astley Castle has ground-breaking contemporary accommodation stitched into the ruined walls of an ancient moated site. This is one of Landmarks most popular properties.

Crownhill Fort was built in the 1860s to protect Plymouth. It's situated at one of the highest points in Plymouth, with half a mile of tunnels below. Today you stay in the Officers’ Quarters.