Book excerpt: Today, there are more than twenty complete zodiacs in Washington, D.C., each one pointing to an extraordinary mystery. David Ovason, who has studied these astrological devices for ten years, now reveals why they have been placed in such abundance in the center of our nation's capital and explains their interconnections. His richly illustrated text tells the story of how Washington, from its foundation in 1791, was linked with the zodiac, with the meaning of certain stars, and with a hidden cosmological symbolism that he uncovers here for the first time. Fascinating and thoroughly researched, The Secret Architecture of Our Nation 's Capital is an engrossing book that raises provocative questions and otters complex insights into the meanings behind the mysterious symbols in Washington.