While walking from Taksim towards Harbiye, some may notice a door with metal bars leading to the school's courtyard beyond which is a statue of Benedict XV.

The Cathedral of the Holy Spirit is the second largest Roman Catholic church in the city after the Basilica of S. Antonio di Padova on İstiklal Avenue in Beyoğlu.

He built many famous 19th century buildings, including the Russian Embassy, the Consulate of the Netherlands and Saint Peter and Paul's Church located in Galata.

The site where the cathedral stands was chosen because the Vatican decided to establish its unofficial office in Istanbul on the same street.

Financial difficulties led to poorer quality construction materials and following an earthquake in 1865, the cathedral was badly damaged.

In other words, the Holy Spirit played a leading role in the Christian community moving beyond the Beyoğlu district (formerly known as Pera) and Galata areas, predominantly non-Muslim at the time.

These vaults designed during the construction of the cathedral, house the mortal remains of various members of Istanbul's Catholic community, including nuns from Notre Dame de Sion and the Archbishop Hillereau.

Giuseppe Donizetti, the royal musician at the court of Ottoman Sultan Mahmud II, who invited him to Istanbul in the first place, is buried in the vaults beneath the cathedral.

He also came on November 30, celebration of Saint Andrew, to meet more than a hundred Iraqi and Syrian refugees as well as African migrants.