Overlooking the Bosphorus from the Sarıyer district, Perili Köşk, also known as the Haunted Mansion, is one of Istanbul’s most intriguing historical buildings. Despite its ghostly nickname, the mansion’s unfinished construction—not paranormal activity—is what gives it a mysterious aura. Commissioned in 1911 by Ottoman pasha Yusuf Ziya, the construction was halted due to World War I, leaving parts of the building incomplete for decades. The mansion’s eerie, half-finished state led locals to believe it was haunted, earning its legendary name. Today, Perili Köşk has been beautifully restored and serves as the headquarters of Borusan Holding, as well as an art museum showcasing contemporary exhibitions. The building itself is a stunning blend of Ottoman and European architectural styles, featuring intricate stonework and impressive bay windows. While its haunting legend continues to spark curiosity, Perili Köşk is now a cultural landmark where history, art, and architecture merge seamlessly on the Bosphorus shoreline