In 2009, construction of the Burj Khalifa in Dubai was completed, reaching a height of 828 meters, more than twice the height of the Empire State Building in New York and almost triple that of the Eiffel Tower in Paris. In this way, it became the tallest building in the world, displacing the Taiwan Taipei 101 skyscraper, which was in second position at 508 meters. We do not know how long this record will be maintained because there are already several architectural projects that have set the goal of reaching the vertical kilometer in height, a milestone for the world of construction.

The Burj Khalifa is an office building that, according to its managers, “is practically a vertical city and an icon of the modern world.” It is designed to withstand the effects of wind, which are noticeable at almost a kilometer high, and any seismic activity that affects the area.

Even so, being the tallest building in the world is not the only Guinness Record held by the Burj Khalifa. It also has the highest nightclub in the world, located on the 144th floor, and the highest restaurant in the world, on the 122nd floor. But for us, the most spectacular record is the one related to the windows. In total, 24,348 windows were necessary to construct the building and 120,000 square meters of glass were used. Its installation was a challenge for the construction teams.

Can you imagine what it must be like to clean all those windows? Well, you don't have to think about it too much, the British network BBC made a documentary a few years ago in the building accompanying the cleaning workers in their titanic work. In total, a team of 36 people spends three months to finish cleaning all the windows of the building. Spectacular!