Who isn't fascinated at watching a building take shape? Why not take advantage of that fascination and build a math lesson! Let's start on top of the world figuratively, of course. Learn about the PETRONAS Twin Towers, the new skyscrapers that have stolen the Sears Tower's thunder as the world's tallest building. These immense buildings stand at an astonishing 1,468.7 feet above street level. Don't miss the facts and figures these statistics are ideal for calculation and conversion math problems.

For more facts and figures, take a look at the World's Tallest Skyscrapers, where you can compare meters to feet on 200 of the world's highest and most famous buildings.

Still have a special place in your heart for the Sears Tower? Well, you can still get your fix at the Sears Tower Virtual Tour. This site includes detailed information about each of the skyscraper's main systems, as well as interesting statistics about the materials that went into the construction of this enormous edifice.

What about all those virtual buildings out there? This is the World Wide Web, after all. Probably the best virtual building on the Web can be found at the Hotel Infinity. This entertaining narrative is the perfect way to introduce your students to the concept of infinity. You'll also find valuable background information on the concept of infinity.