THIS jaw-dropping house was once a World War One-era concrete factory before an architect spent 45 years turning it into his home.
Ricardo Bofill fell in love with the huge derelict concrete structure, which is near Barcelona, in 1973.
Over the decades Bofill and his team added lush vegetation and turned it from an industrial shell into a unique work of art - La Fabrica.
Bofill said: "Seduced by the contradictions and the ambiguity of the place, we quickly decided to retain the factory, and modifying its original brutality, sculpt it like a work of art.
"Presently I live and work here better than anywhere else. It is for me the only place where I can concentrate and associate ideas in the most abstract manner."
The exterior is covered by grass, eucalyptus, palm, and olive trees and gives the impression that the property has been partially reclaimed by nature.
Every room is uniquely furnished but he kept the raw concrete walls as a "memory of the structure’s former use".
He added: "I have the impression of living in a precinct, in a closed universe which protects me from the outside and everyday life.
"Life goes on here in a continuous sequence, with very little difference between work and leisure.
"I have the impression of living in the same environment that propelled the Industrial Revolution in Catalonia."
As well as acting as his home and offices, the main factory hall has been turned into a conference room.
In January a luxury houseboat converted from a 1930s steel barge went on sale for £3.7 million – making it one of the most expensive houseboats in Britain.