One of the things that helps make Washington's vistas so grand--but continually frustrates developers and architects--is the district's Congressionally-imposed115-year-long ban on skyscrapers. Congress passed the 1899 Height of Buildings Act, and then modified the law in 1910, creating a complex set of restrictions based on location and street width.
It might seem intuitive that the skyscraper ban was imposed to protect views of the U.S. Capitol and the Washington Monument. But oddly, Congress was prompted to restrict construction heights because of Dupont Circle residents' griping about being overshadowed by what today is regarded as one of the District's architectural treasures--The Cairo apartments at 1615 Q Street NW.
No doubt you are familiar with D.C.’s most prominent tributes to history -- the Washington Monument, the Lincoln Memorial, possibly even that unique sculpture of Einstein lounging on Constitution Avenue. But have you ever heard of the Zero Milestone? Standing next to the White House, this small monument is easily missed, but it holds a tremendous amount of history, all contained in a 2x4 hunk of granite…well, actually it extends out a little farther than just that spot.