The original National Observatory was authorized by President Tyler in 1842 and completed in 1844 according to plans prepared by Lieutenant James Melville Gilliss. The observatory was the site of notable advances in astronomy and mathematics, and is…

The American Red Cross was founded by Clara Barton in 1881 and chartered by Congress in 1900. The building was built as a memorial to the women of the Civil War thanks to U.S. and private funds. It exemplifies the McMillan Plan's emphasis on…