The Al-Omari Grand Mosque, formerly known as the Church of St. John, stands as a historic religious edifice in the heart of Beirut Central District, Lebanon. With a history dating back to the Crusader period in the 12th century, it was initially built by the Knights Hospitaller as the city's largest church. The structure reflects a blend of architectural influences due to the various civilizations that have occupied Beirut. After the Mamluks captured Beirut, the church was transformed into a mosque in 1291 and has since been a significant Islamic place of worship. The mosque bears the name of the Mamluk Sultan Al Omari and has undergone several restorations, most notably after the Lebanese Civil War. The serene and spiritual ambiance of the mosque is complemented by its stately Ottoman architectural features, including the prominent minaret, ornamental arches, and elaborate inscriptions. The mosque stands as a testament to the rich cultural and religious history of Beirut and is an iconic landmark in the city's skyline.