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 snug cottage on the towpath of the Stratford-upon-Avon Canal was built for the man who maintained not just the lock but also the stretch of canal up to the next lock.

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.