In Istanbul, high up on the sunny facades of mosques and other historical buildings, you may see elaborate houses built for birds if you look carefully enough.
Engineers at the Massachusetts Institute of Technology say that had it been built, a design for a bridge in the transcontinental city would have been viable.
With Topkapi Palace, the administrative and residential power centre of the house of Ottomans, the Turkish government has inherited many valuable holy relics including the Prophet Muhammad's personal belongings.
Straddling Asia and Europe, Istanbul is the biggest city in Turkey and home to a whole host of museums. This list aims to serve as a starting point for curious travellers so you can explore all the riches of the city.
For more than 60 years, the Turkish science historian searched libraries around the world, creating a comprehensive bibliography of almost every known text on Muslim-Arabic sciences, most of which is borrowed and yet overlooked by the West.
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