Washington DCs Buildings layed out in pentagram

Source: earth.google.com Sattelite-image of area of White House in Washington DC

Why right Hand in front of body and inside jacket ?

Source: www.wikipedia.org Samuel Francis Du Pont Image of Samuel Francis Du Pont

Source: www.wikipedia.org Andrew Carnegie Image of Andrew Carnegie

Source: www.wikipedia.org George Washington Image of George Washington

Source: www.wikipedia.org John Alexander Logan Image of John Alexander Logan

Source: www.wikipedia.org John Alexander Logan Image of John Alexander Logan