Fatih Mosque, also known as the Conqueror's Mosque, is a historical mosque in Istanbul, Turkey. It was built by the Ottoman Empire's ruler, Sultan Mehmed II, also known as Mehmed the Conqueror, in the 15th century after he conquered the city of Constantinople (now Istanbul). The mosque is named after him.

Fatih Mosque is considered one of the most important architectural landmarks in Istanbul and is a popular tourist attraction. It is also an important religious site for Muslims, as it is one of the city's largest and most important mosques. 

The mosque is known for its grand size, elaborate architectural style, and rich history. It is a blend of Byzantine and Ottoman architectural styles, combining traditional Turkish and Islamic elements.

The mosque complex includes a large central prayer hall, a courtyard, several smaller prayer rooms, a library, and various other facilities. It is surrounded by a high wall and has several minarets, or towers, that are used for the call to prayer. 

The mosque's interior is adorned with intricate decorations, including marble columns, beautiful tiles, and large chandeliers.

Fatih Mosque is an important religious and cultural site in Istanbul and is considered a symbol of the city's rich history and cultural heritage.