According to Wikipedia:
“The golden ratio, φ = (1+√5)/2 ≈ 1.618, [...] plays an important role in regular pentagons and pentagrams. Each intersection of edges sections the edges in golden ratio: the ratio of the length of the edge to the longer segment is φ, as is the length of the longer segment to the shorter. Also, the ratio of the length of the shorter segment to the segment bounded by the 2 intersecting edges (a side of the pentagon in the pentagram’s center) is φ. As the four-color illustration shows:
The pentagram includes ten isosceles triangles: five acute and five obtuse isosceles triangles. In all of them, the ratio of the longer side to the shorter side is φ. The acute triangles are golden triangles. The obtuse isosceles triangle highlighted via the colored lines in the illustration is a golden gnomon.”
It appears we have a pentagram embedded into the design of Washington DC. It is important to note that the Whitehouse sits at the lower point of this. The origin of the pentagram or pentagon is
believed to be derived from occult astrology.
Starting with the top left point, we have:
(5) Dupont Circle Fountain
The fountain at Dupont Circle, designed by Daniel Chester French and architect Henry Bacon, the co-creators of the Lincoln Memorial. According to Embassy.org:
http://whatisthepyramid.com/2009/07/11/pentagram-lucifer-venus/