The Blue Mosque is one of Istanbul's most recognizable sights, with its sweeping domes and six slender minarets rising above Sultanahmet Square. Step inside and you'll see why travelers talk about the blue Iznik tiles that cover the interior walls and the light that streams through hundreds of stained-glass windows Dress modestly.; some visitors note shawls and outer layers may be offered at the entrance if you need them, but local conditions vary.
The mosque is still an active place of worship, so you'll need to remove your shoes before entering. Women are asked to cover their hair. The atmosphere inside is calm and cool, even when the square outside is busy. Families and solo travelers alike can enjoy the visit, though reports commonly mention it's not clear if strollers or young children are easy to manage. Sultanahmet is a walkable area with plenty of museums, markets, and other major sights nearby, making it easy to fill a day here.
Expect some waiting during peak times, especially around midday prayers. Early mornings or late afternoons tend to be quieter. If you're after photos, the mosque's exterior is just as striking as the interior, especially when the light is soft.