Mosque of Sultan Süleyman, Turkey

The Mosque of Sultan Süleyman the Magnificent (1557) is Istanbul's largest and grandest.
Designed by the Ottoman Empire's greatest architect, Mimar Sinan, the Süleymaniye dominates the city's Third Hill, just north of Istanbul University, overlooking the Golden Horn (map).
It's an easy walk of less than 10 minutes around the university from Beyazıt Square and the Grand Bazaar to the Süleymaniye.
After three years of extensive restorations by architects and calligraphers under the watchful eye of architectural historians, and expenses of TL21 million, the mosque was re-opened to visitors during Kurban Bayramı in 2010.