check this out! big penny strcuture Answered
this guy is LOADED. and bored. too much time on his hands.
edit: see more at http://www.fincher.org/Misc/Pennies/Sent3b.shtml
edit2: this guy was making this for charity NOT for himself
From Marcelo Bezos at pennypyramidproject.com.
I recently built a World Record Penny Pyramid using over 289,000 pennies. I'm currently adding more coins to the pyramid in an attempt to reach the 1,000,000 penny mark by August of next year,
Marcelo is raising money for a charity to raise awareness of Colorectal Cancer.