Introduction
Ever look up at a giant skyscraper and wonder, "Man, that thing is HUGE!" Well, you're not alone. These sky-piercing buildings are like muscles on a city, showing off how much engineering might we humans have. But with so many crazy structures out there like Burj Khalifa Dubai, it's hard to keep track of the biggest. Let's dive into the world of who's king or queen of the high rises!

Tallest vs. Biggest: Not Always the Same
First things first, there are a few ways to measure the "biggest building." We can look at how tall they reach or how much total space they have inside.

Tallest Building in the World: Burj Khalifa Dubai

Burj Khalifa Dubai is the undisputed champ in the height category. Burj Khalifa shoots up a whopping 828 meters (2,717 ft) – that's taller than 3 Empire State Buildings stacked on top of each other! Since it opened in 2010, it's been the undisputed king of the cloud-kissers.

Biggest Buildings in the World Width Wise: Aerium, Germany
If you want to talk sheer size, then Germany has a surprising champion: the Aerium near Berlin. This giant building isn't quite what you might picture though. Imagine a massive warehouse big enough to fit 13 Empire State Buildings inside – that's the Aerium! It's more like a giant airship hangar than a traditional building, but with 36.7 million cubic meters (1.3 billion cubic feet) of space, it takes the cake for volume.

Biggest Buildings in the World Under Construction: The Jeddah Tower
This skyscraper under construction might steal the tallest building title from Burj Khalifa Dubai. If they finish it, the Jeddah Tower will be a whopping 1,007 meters (3,307 ft) tall – that's almost twice the height of the Eiffel Tower! Construction has been on hold for a while though, so it's a waiting game to see if it will ever be completed.

Biggest Buildings in the World Saudi Arabia: Abraj Kudai Complex
This massive complex in Mecca is like a whole city in itself. While not the tallest building, it covers the most ground, boasting a mind-blowing 1.5 million square meters (16 million square feet) of floor space. That's enough space to fit like 200 soccer fields! It's got hotels, a shopping mall, and even a clock tower that's taller than most buildings.

The Bottom Line
The race for the biggest building isn't over yet, but how we measure "biggest" might change in the future. Architects are thinking more about cool features like sustainability and community spaces these days. The future of skyscrapers might be less about bragging rights and more about creating awesome places for people to live, work, and play.