You may wonder why this marvellous structure (Sultan Ahmet Camii in Turkish) built directly opposite the Haghia Sofia is known to Westerners as the Blue Mosque. The reason becomes obvious once you step inside (you’ll be obliged to take off your shoes), where you will see that much of the interior is covered by spectacular Iznik tiles, which are overwhelmingly blue. With its awesome size and six towering minarets this mosque was originally seen as a controversial and sacrilegious attempt to rival the architectural grandeur of Mecca. You really must go inside to experience the inexplicable feeling of peace that resonates through this marvellously spacious and beautifully decorated mosque. A glorious structure indeed, the Blue Mosque is nearly 1000 years newer than the Haghia Sofia, yet the exquisite harmony of these two sacred structures facing one another across a large courtyard is an experience not to be missed on any trip to Istanbul.