Rocchetta Mattei: the castle where science, mystery and the devil met

High above the Reno Valley, in the Bolognese Apennines, there is a castle that seems to have wandered out of a dream. Its towers rise among the hills near Riola, its corridors twist into courtyards, staircases lead unexpectedly into other rooms, and medieval, Moorish, Gothic and Art Nouveau elements coexist as if architectural rules had never existed.
This is Rocchetta Mattei, and perhaps the strangest thing about it is that the building makes perfect sense once you know the man who created it.

Count Cesare Mattei was not simply building a residence, but the physical expression of his own extraordinary world.
Born in Bologna in 1809, he was a writer, politician and self-taught medical practitioner. His life changed dramatically after the death of his mother in the 1840s, when his disappointment with conventional medicine pushed him towards the study of alternative forms of healing. He explored herbalism, homeopathy and other theories and eventually developed his own system, which he called electrohomeopathy.
The name sounded scientific, the theory was anything but conventional.
Cesare believed that health depended on restoring an electrical balance within the human body. His treatments combined granules prepared from plants with five so-called “electric fluids”, identified by colours and supposedly carrying different electrical polarities. The exact preparation of the remedies was kept secret, helping to surround the system with an additional aura of mystery.
Today, electrohomeopathy has no recognised scientific basis, but in the nineteenth century its popularity was very real. Cesare’s preparations became an international phenomenon, attracting patients from different social classes and spreading far beyond Italy.
In 1881 there were dozens of authorised distribution depots in Europe and elsewhere; by 1884, the network had reached 107 locations, extending as far as the United States, Haiti and China.
There was even a connection with the highest circles of European society. Cesare Mattei’s reputation reached Russia, and his name became sufficiently familiar across Europe to enter popular culture and literature.

That is where the story takes an unexpected turn.
In Fyodor Dostoevsky’s The Brothers Karamazov, the Devil appears to Ivan Karamazov complaining about an attack of rheumatism. He recalls having written to Count Mattei and receiving a book and drops from him.
The episode is deliberately comic and ironic — and the supposed cure is ultimately attributed not to Cesare Mattei, but to Hoff’s malt extract — yet the joke only works because readers of the time were expected to know exactly who the man was.
Few forms of advertising could be stranger than that: an Italian self-taught healer from the Apennines had become famous enough for Dostoevsky to put his name into the mouth of the Devil.

Meanwhile, Cesare was creating something equally unusual in stone.
In 1850 he purchased the land where the ruins of the medieval Rocca di Savignano stood and laid the first stone of his new residence. He moved there permanently in 1859, but the building was never really finished in the conventional sense. Cesare continued to modify and enlarge it throughout his life, turning it into both his home and the headquarters of his medical enterprise.
The result is one of the most eccentric architectural creations in Italy.
There is no single style at Rocchetta Mattei because there was never supposed to be one.
Neo-medieval towers stand beside Moorish arches; courtyards evoke the Alhambra in Granada; the chapel takes inspiration from the Great Mosque of Córdoba; later additions introduce Art Nouveau details.
The building becomes a maze of staircases, loggias, terraces, towers and unexpected passages.
Even the details play with illusion. Some elements that appear to be carved stone or precious materials were actually made using plaster, cement, wood, canvas or papier-mâché and then decorated to imitate something more luxurious.
It is architecture as theatre — appropriate for a man whose life constantly blurred the boundaries between science, symbolism, spectacle and belief.
One of the most evocative spaces is the Courtyard of the Lions, inspired by the Alhambra.
Another is the chapel, where Islamic architectural references meet medieval Christian forms. And somewhere in this extraordinary maze lies the so-called Hall of Ninety, surrounded by one of the castle’s most persistent legends: Mattei supposedly imagined celebrating his ninetieth birthday there with eighty-nine other people who had also reached ninety. The room was completed only after his death, so the eccentric celebration never took place.

The castle was also a place where Cesare’s patients could stay. As his reputation grew, additional accommodation was created around the Rocchetta for the people arriving from elsewhere to seek his treatments.
The castle consequently became not merely a private residence but the centre of an entire world built around the Count and his “new medicine”.

Either way, Cesare died at the Rocchetta in 1896, aged 87. His adopted son Mario Venturoli continued the business and inherited the secret of the preparations. The electrohomeopathic enterprise survived for decades, although its influence gradually declined.
The Bologna laboratories eventually closed in the late 1960s, bringing the original production to an end.
The Rocchetta itself experienced an equally dramatic decline.
After passing through different owners, it was used for a time as a hotel and restaurant before years of abandonment left the extraordinary complex in poor condition.
In 2005, the Fondazione Carisbo acquired the property and began a major restoration project.
The castle eventually returned to the public, allowing visitors to enter the strange world Cesare Mattei had spent decades creating.
Its story has also continued on screen. The peculiar atmosphere of the Rocchetta attracted filmmakers, including Pupi Avati, who used it for Balsamus, l’uomo di Satana and Tutti defunti… tranne i morti, while Marco Bellocchio filmed Enrico IV there in 1984.

Perhaps that is why Rocchetta Mattei remains so fascinating.
It is not simply an eccentric nineteenth-century castle, nor simply the monument to a controversial medical theory. It is the surviving portrait of a man who believed he had discovered a new way of healing and built an entire architectural universe around that conviction.
Its towers, coloured fluids, secret formulas, Moorish courtyards and labyrinthine passages all belong to the same story.
And somewhere along the way, that story travelled from a castle in the hills of Emilia-Romagna into the pages of one of the greatest novels of Russian literature — where, with a touch of Dostoevskian irony, even the Devil had apparently heard of Count Mattei.