1: Burj Khalifa, Dubai
Burj khalifa also know as burj Dubai at is longest building in the world with the hight 829.8 meter (2722ft.) It breided in late of 2008 and contractions started in 6 January 2004. The material used for building this is glass, steel, aluminium and reinforced concrete. The construction of this building is reportedly based on government of Dubai to diversity from an oil based economy, for Dubai to get International recognition. This building 1st named Burj Dubai but was renamed in honour of ruler of Abu Dhabi and also president of UAE.
2: Sanghai Tower, Chaina
Shanghai tower is 63 meter (2073ft.) Long with 128 floor tallest building after Burj Khalifa in the world. It has world's highest observation deck with building. Shanghai Tower have world fastest elevators a top speed of 20.5 metre per second. The construction started on 29 November 2008 and completed on 18th February 2015. This building is was designed by American architectural firm Gensler.
3: Mekkah Royal Clock Tower
Makkah Royal Clock Tower has the world's largest clock face and this is third tallest building in the world. Construction of the building started in 2004 and completed in 2011 and it has total height of 601 Meter. Makkah Royal Clock Tower is a beautiful example of civil engineering. Total 96 Elevators and lifts available in this building. All four face clock visible from 25 km away.