The world's tallest buildings feature elevators that ascend 100 floors in a minute, with views that oversee some of the world's biggest cities.
Officially the tallest building in the world, the 160-story Burj Khalifa stands at a reported 2,717 feet. The building features an elevator with the longest travel distance in the world - 120 stories. The tower has also broken the record for tallest structure, previously held by the KVLY-TV mast in Blanchard, North Dakota. (Dennis B Mallari)
The Abraj Al-Bait Towers, also known as the Mecca Royal Hotel Clock Tower, in Mecca, Saudi Arabia, is the tallest building in Saudi Arabia and the tallest hotel in the world. (AP)
