Facing Hagia Sophia across Sultanahmet Square, the Blue Mosque is one of the defining landmarks of Istanbul’s Historic Peninsula.
Its official name is Sultan Ahmed Mosque, after Sultan Ahmed I, who commissioned the building in the early 17th century.
Today it remains an active mosque as well as one of Istanbul’s most visited historic monuments.
Why Is It Called the Blue Mosque?
The name “Blue Mosque” comes from the decorative tiles used throughout the interior.
Thousands of ceramic tiles, many associated with the İznik tradition, create floral and geometric patterns across the lower walls and galleries.
From outside, however, the mosque is better recognized by its large central dome, cascading semi-domes and six minarets.
When Was the Blue Mosque Built?
Construction took place between 1609 and 1616 during the reign of Sultan Ahmed I.
The architect was Sedefkâr Mehmed Ağa, who worked within the classical Ottoman architectural tradition shaped by earlier masters such as Mimar Sinan.
The mosque formed part of a larger complex that once included educational, charitable and commercial buildings.
What to See Inside
The interior combines scale with carefully controlled light.
Look for the tile decoration, stained-glass windows, calligraphy, marble mihrab and minbar.
Although it is easy to concentrate only on the famous blue tiles, the balance between the central dome and surrounding semi-domes is equally important to understanding the building.
Visiting an Active Mosque
The Blue Mosque continues to function as a place of worship.
Visitors should dress respectfully, remove their shoes before entering the prayer area and follow instructions provided by mosque staff.
Tourist access may be paused during daily prayers and particularly around Friday prayer.
There is normally no need to treat the mosque like a museum visit. Enter quietly, allow worshippers their space and take time to appreciate the architecture.
What to Visit Nearby
The Blue Mosque stands beside the former Hippodrome of Constantinople and directly opposite Hagia Sophia.
Topkapi Palace and the Basilica Cistern are also within easy walking distance.
This concentration of monuments makes Sultanahmet the natural starting point for travelers exploring historic Istanbul.