The document discusses different architectural styles found in Washington D.C., including neoclassical, gothic, and modern designs. It compares the Parthenon to the National Gallery of Art's West Wing and describes their different column styles. The text outlines some iconic neoclassical buildings like the National Gallery and the Supreme Court, as well as the dome of the Capitol building. Gothic architecture is represented by the National Cathedral, and modern designs include I.M. Pei's East Wing of the National Gallery with its skylights and commissioned artworks. The Washington Monument is also discussed.