Located in northwest Turkmenistan, Kunya-Urgench was once the capital of the Khorezm region. Today, its ruins and monuments reveal much about the development of Islamic architecture in Central Asia. Dating back as early as the 11th century, it features fortresses, mausoleums, a mosque, the gates of a caravanserai and a 60-metre high minaret. Regarded as the ‘heart of Islam’ in the 13th century, the city rebelled against Genghis Khan and was destroyed by the Mongols. It was destroyed once again in the 14th century by the army of Tamerlane. Yet, despite these defeats, many of Kunya-Urgench’s monuments have remained intact. The most beautiful is the Sultan Tekesh Mausoleum, with its instantly recognizable turquoise dome.