From the website http://freemasonry.bcy.ca/anti-masonry/anti-masonry06.html Doesn't the satanic design of Washington, DC’s street plan prove that there’s a masonic conspiracy? No. It does not take much imagination to look at a map of Washington, DC and see the outline of a five-pointed star in the streets to the north of the White House. But the assumptions required to believe that this arbitrary geometric shape reveals a secret political or occult agenda have no foundation. One has to assume that the pentagram is a uniquely evil symbol, highly valued by freemasons who believe that its physical representation can have a real impact on the world and that freemasons are responsible for intentionally including it in Washington’s street plan. None of these assumptions bear scrutiny. First, the pentagram is not an exclusively satanic symbol nor does it have any particular masonic significance. Second, Freemasonry, promoting rationalism, places no power in symbols themselves. It is not a part of Freemasonry to view the drawing of symbols, no matter how large, as an act of consolidating or controlling power. Third, there is no published information establishing the masonic membership of the men responsible for the street plan. Although Freemason George Washington commissioned Pierre Charles L'Enfant and approved the street plan executed by Andrew Ellicott and Benjamin Bannecker, they were not masons. Drawing lines on a map of Washington, DC proves nothing other than the physical existence of streets and buildings.

Because Sam and Dean from Supernatural

It's not a pentagram cause they forgot one of the sides. But you can go ahead and draw one in there to make your narrative work.