Some people just have too much time on their hands.
I guess the BEP ( Bureau Of Engraving And Printing ) had blueprints of the WTC cause the $20 bill was in circulation before the WTC was built.
I predict that when I fold my $1,000 bank note when I get it, I will be able to see that WTC "tourist guy" from atop the observation deck.
Disclaimer- Yes, I really want a $1,000 bank note and no I will not fold it to see "tourist guy".