SKYLAND RESIDENTIAL AND OFFICE TOWERS, ISTANBUL, both 284 metres: The twin towers take our joint ninth place. Completed in 2017, they are the tallest in Istanbul, which now has the second highest number of buildings over 150m after Moscow. The mixed- use complex features a hotel and conference centre, while the residential tower features over 800 residences. Nicole Tung / Bloomberg

Megaprojects: 10 tallest buildings in Europe - in pictures