The world's tallest building is perhaps the greatest architectural and engineering accomplishment of man. While most construction methods used for our local homes and buildings have not changed in the last 50 years or so, the Burj Dubai pushes the envelope of technology, sustainability, and functionality.
The fact sheet is amazing. For example, the concrete used in the structure would be sufficient to build a sidewalk 2,065 miles long - about the distance from NYC to Monterrey, Mexico.
Here's an infographic with more detail: