In case you are wondering who currently holds the title of Tallest Man-Made Structure in the World, then the answer you are looking for is the Burj Khalifa in Dubai.
Lost in a lot of the hoopla, fancy cars, in door skiing slopes and 3 story aquariums, is the Burj Khalifa. However, it truly is one of the most remarkable structures built. If you only had a short time in Dubai, I would definitely recommend making a visit above anything else. Entry to the lookout tower of the Burj Khalifa is actually accessed through the Dubai Mall. If you plan to go, you can save a considerable amount of money by buying your tickets online beforehand.
Once at the top you will be able to have a 360 view of Dubai, along with the Persian Gulf off in the distance. I thought Dubai was a densely packed city, filled with skyscrapers. Once I got to the top of the tower, the view made Dubai look so small, and made me truly realize how much open desert exists.
My only recommendation, that I regret not doing myself, is that you make a visit at night. Being able to see the entire city light up below probably looks amazing at night.