St. Sergius and St. Bacchus Church, also known as the Küçük Ayasofya Mosque, is a hidden gem located in the heart of Istanbul’s historic district. This Byzantine-era church-turned-mosque is a must-visit destination for those interested in history, architecture, and religion.

The church was built in the 6th century during the reign of Emperor Justinian I and was dedicated to two Roman soldiers, Sergius and Bacchus, who were martyred for their Christian faith. The church was converted into a mosque during the Ottoman era and has undergone several renovations over the centuries.

The church’s architectural style is a blend of Byzantine and Islamic influences, with a basilica-shaped plan and a dome added during the Ottoman period. Visitors can admire the intricate mosaics and frescoes that adorn the interior walls and ceilings, which have been restored to their former glory. The church also has an underground cistern that was used to collect rainwater.

The mosque’s courtyard features a beautiful fountain and is surrounded by arcaded porticoes that provide shade and shelter. The mosque’s minaret is a relatively recent addition, built during the 19th century.

St. Sergius and St. Bacchus Church is open to visitors every day of the week, although prayer times can limit access. Visitors should dress modestly and remove their shoes before entering the mosque. Photography is allowed but flash is prohibited, and visitors should be respectful of those who are praying.

Overall, the church-turned-mosque is a unique and fascinating attraction that is often overlooked by tourists. Its blend of Christian and Islamic architecture and rich history make it a must-see destination in Istanbul.