I thought it would be good to add a few resources to The Best Sites For Learning About The Presidential Inauguration that show and tell about Washington, D.C. in an accessible way.
Here are four:
The Library of Congress has a feature called Explore the Capitol, which includes audio support for the text.
EL Civics has a lesson on Washington, D.C. specifically designed for English Language Learners.
MSN has a good slideshow on the key places in the city, and Infoplease has a similar presentation.