Castello di Sammezzano, Tuscany

Castello di Sammezzano boasts the most extravagant Moorish-revival interiors in Italy, with over 365 kaleidoscopic rooms rivaling the Alhambra's intricacy. Abandoned since the 1970s, its patterned ceilings and 24,000 individually painted tiles remain largely untouched. Despite no official visitor count, restoration estimates exceed €10 million. Its architectural wealth surpasses #8 Forte di Bard's military austerity, offering a dreamlike experience that few castles on this list can match.