Abandoned buildings repurposed into astonishing new ones.

Blank walls of different buildings in cities and towns are huge canvases that are perfect for street art. Check out some of the best pieces of street art around the world.

Business Insider asked different architects to name one building which has had the greatest influence on building design, inspired them most, or which they find absolutely stunning. Here are the results.
 

Here is the list of the most expensive buildings ever built with all adjustments for inflation.

These before and after pics show the dramatic effects of a little bit of cleaning.