From the outside, this 18th century tower looks only like a 33ft stone tower, but underneath lies a quirky, super modern two-bedroom home.
The property, built beneath the 24ft wide tower, has a media room, a reception hall, a large open-plan kitchen and dining and sitting rooms.
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With a guide price of £1.75m, the Grade II listed building even comes complete with an impressive roof terrace that boasts 360-degree views of the Cotswolds.
The 300-year-old Round Tower, in East Gloucestershire, has had a varied history as a hunting lodge, a castellated folly and even a windmill before it became an ingeniously designed 21st century home.
Bought from a local farmer for £300,000 in 2004, a property developer transformed the historic area into the stunning home it is now.
The tower was part of the Bathurst Estate dating back to the 1700s and served as a hunting lodge to Cirencester Park - a nearby stately home.
The castellation, which is now atop the home that is both historical and contemporary, was added at a later date.
It was used as a windmill in the late 1700s and early 1800s and then a home until it was abandoned in 1958 and fell into disrepair.
The house has all the latest mod cons with a wireless lighting system, zoned security and home entertainment systems.
It also includes a coach house with a garage for two cars and staff or guest accommodation with a kitchen, bathroom, sitting room and mezzanine bedroom.
The home is surrounded by four acres of gardens and grounds and has an outdoor heated swimming pool sunk into the landscape.
Sam Trounson, from Strutt & Parker, said: "What makes follies and unique homes so appealing? Their individual nature and style.
"A folly is typically quirky and intriguing and usually of great architectural interest.
"All sorts of people want to have one – from holidaymakers who typically go to the Landmark Trust, to weekenders – and the Cotswolds has always been a very popular place to have a second home.
"Although a period building will always need upkeep and repairs, and follies in particular will have an unconventional layout, any such constraints are often outweighed by the charms of the architectural style."