The national debt is 14 Trillion dollars.
Here is a visual view of what the National Debt looks like
if it were stacked $100 bills. Of course when this diagram was made, it was for 9 trillion not 14 trillion. So you have to increase the visualizations by about 50%.
http://www.pagetutor.com/trillion/usdebt.html
Or another way to think about it-
If you stacked 1 Trillion $1 bills, your stack would be
68,000 miles in space. So a stack of $14 Trillion 1$ bills would be a mere 952,000 miles into space. As a reference point the moon is 238,857 miles from the earth.
http://www.pagetutor.com/trillion/index.html
http://www.letfreedomringusa.com/news/read/383