All you want to know about the original Elephant House: http://lcweb2.loc.gov/pnp/habshaer/dc/dc1000/dc1027/data/dc1027data.pdf All you want to know about the Bird House: http://lcweb2.loc.gov/pnp/habshaer/dc/dc1000/dc1027/data/dc1027data.pdf Pictures: Caged Bears - [Group of people looking at bears in cages in the National Zoo, Washington, D.C.] Bears enjoying a jazz band: Jazz for the bears Buffalo House: http://www.loc.gov/pictures/resource/npcc.00168/ Grounds: http://www.loc.gov/pictures/resource/cph.3c31946/ http://www.loc.gov/pictures/resource/cph.3c05532/ Great Flying Cage: http://www.loc.gov/pictures/resource/cph.3c05532/ Bird House: http://www.loc.gov/pictures/resource/thc.5a46683/