The Rüstem Paşa Mosque is a historic mosque located in Istanbul, Turkey. It is located in the Fatih district of the city, near the Grand Bazaar, and is known for its beautiful architectural features and intricate tilework. The Ottoman architect Mimar Sinan built the mosque in the mid-16th century on the orders of the Ottoman grand vizier Rüstem Paşa.

The Rüstem Paşa Mosque is a small but elegant building with a central dome, two smaller domes, and two minarets (tall, thin towers). The mosque's exterior is adorned with intricate carvings and decorations, including calligraphy, geometric patterns, and glazed tiles. 

The mosque's interior is equally impressive, with a large central prayer hall and a series of smaller prayer rooms. The walls and ceiling of the mosque are adorned with beautiful frescoes and calligraphy.

The Rüstem Paşa Mosque is an active place of worship and is open to the public. It is an important site for the city's Muslim population and is a popular destination for tourists and pilgrims. The mosque is a beautiful and historic site and is a must-see destination for anyone interested in the history and culture of Istanbul.