The Blue Mosque, also known as the Sultan Ahmet Mosque, is a historical mosque located in Istanbul, Turkey. It was built between 1609 and 1616, during the reign of Ottoman Sultan Ahmet I, and is considered one of the greatest examples of Ottoman architecture. The mosque is known for its interior decoration, which is characterized by its blue Iznik tiles, hence the name "Blue Mosque."

The mosque has six minarets and a central dome that rises to a height of 43 meters. It is one of the largest mosques in Istanbul, with a capacity to hold 10,000 worshippers at once. The interior of the mosque is adorned with intricate calligraphy, marble pillars, and a large chandelier, adding to its beauty and grandeur.

In addition to being a place of worship, the Blue Mosque is also a popular tourist attraction, attracting millions of visitors each year. Visitors are allowed to enter the mosque, but they must remove their shoes and cover their heads before entering, out of respect for Islamic customs and traditions.