It's the Grand Designs folly that was transformed from a 250-year old ruin into a modern designer home.
And now the unique property in the rolling landscapes of the Vale of Aylesbury in Buckinghamshire is for sale.
After costing £300,000 to rebuild - in addition to the £100,000 to buy the land - the renovated two-bedroom house is currently for sale for £850,000 via estate agents Hamptons International.
The couple behind the rebuild, who have had their second child since starting the project, put the home up for sale nine months after moving in because it is now too small for them.
Pictured: Grand Designs' Kevin McCloud with Jimmy Fernandez and his wife Mimi, the couple who revived the Grade-II listed property
The renovation of Dinton Castle - which is also known as Dinton Folly - featured in an episode of Grand Designs on Channel 4 earlier this year.
In the programme, its presenter Kevin McCloud stands outside of the ruin at the start of the project, saying: 'It may have the shape of a mini Tudor tower, but this mini-castle wasn't built for defence. It was, in fact, built 250 years ago to house a gentleman's fossil collection.
'Of course, now it has become something of a relic itself.
'It's a building that doesn't want to stand up anymore. It just wants to fall over in two big halves. Well, it's going to as its owners are going to try and repair it.'
The renovation of Dinton Castle - which is also known as Dinton Folly - featured in an episode of Grand Designs on Channel 4 earlier this year
Original features: The renovated living room saw much of the original brick left exposed
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Pictured: Dinton Folly before and after the extensive renovation project
The couple who revived the Grade-II listed property were architect Jimmy Fernandez and his wife Mimi.
Jimmy exclusively told MailOnline Property: 'The project was more transformative than we had originally anticipated as we had our second child during the house build. We are now a happy and growing family of four in a two-bedroom house, so it is time for us to move on to the next stage in our lives.
'This is a beautiful and award-winning house, ideal for a couple looking to live in a unique place that is truly inspiring.'
What a Grand Design! The Grade-II listed property in Buckinghamshire is for sale for £850k
History in the making: The folly was originally built 250 years ago to house a gentleman's fossil collection
There is a kitchen on the lower floor, with a staircase to the first and second floors
The property's owner - and architect - Jimmy Fernandez had the staircase build to exact specifications
Today, there are two bedrooms of equal size on the second floor of Dinton Folly
In the Grand