Arap Mosque, tucked away within the historic streets of Istanbul’s Karaköy neighborhood, offers visitors a fascinating glimpse into the city's diverse religious and cultural heritage. Originally constructed as a Dominican church in the early 14th century, this distinctive Gothic-style building was transformed into a mosque following the Ottoman conquest of Constantinople in 1453. Known locally as "Arap Camii," or "Arab Mosque," it is named for the Andalusian Arabs who settled in the surrounding area after fleeing Spain. Stepping inside, visitors immediately notice the mosque’s unique architectural features—pointed arches, stone columns, and wooden ceilings—that vividly recall its medieval origins. Surrounded today by lively cafés, art galleries, and historic alleyways, Arap Mosque remains a hidden gem for tourists eager to discover Istanbul’s intriguing mix of Byzantine, European, and Islamic history.