World Skyscraper Day is observed every year on 3 September.
The date is the birth anniversary of the American architect Louis Sullivan, born in Boston on 3 September 1856 and regarded as a father of the skyscraper.
The Council on Tall Buildings and Urban Habitat classifies a building of 300 metres or more as supertall and 600 metres or more as megatall.
Several supertall towers are due for completion by 2030, led by the 557-metre Burj Binghatti Jacob & Co Residences in Dubai.
Palais Royale in Mumbai, at about 320 metres, is India's tallest building.
General Awareness - important days and static general knowledge
General Awareness - important days, world's tallest structures
General Awareness - important days
A building of 300 metres or more, as classified by the Council on Tall Buildings and Urban Habitat.
A building of 600 metres or more; the Burj Khalifa is the best-known example.
Louis Sullivan's principle that a building's shape should be dictated by its purpose.
Council on Tall Buildings and Urban Habitat - the international body that sets height criteria and adjudicates tall-building records.