We came across this photo at the Library of Congress (how meta). Click on it for greater detail.

[Click here for larger, high-quality version.]
Construction of the Library of Congress, Washington, D.C., May 10, 1893
Construction of the Library of Congress, Washington, D.C., May 10, 1893
Tom founded Ghosts of DC on January 4th, 2012 as a blog to uncover the lost and untold history of Washington, D.C. He has lived in the city for over a decade and loves exploring every corner of the District.