<P> The Hall of Columns is located on the House side of the Capitol, home to twenty - eight fluted columns and statues from the National Statuary Hall Collection . In the basement of the Capitol building in a utility room are two marble bathtubs, which are all that remain of the once elaborate Senate baths . These baths were a spa - like facility designed for members of Congress and their guests before many buildings in the city had modern plumbing . The facilities included several bathtubs, a barbershop, and a massage parlor . </P> <P> A steep, metal staircase, totaling 365 steps, leads from the basement to an outdoor walkway on top of the Capitol's dome . The number of steps represents each day of the year . Also in the basement, the weekly Jummah prayer is held on Fridays by Muslim staffers . </P> <P> Contrary to a popular myth, D.C. building height laws have never referred to the height of the Capitol building, which rises to 289 feet (88 m). Indeed, the Capitol is only the fifth - tallest structure in Washington . </P> <P> The House of Representatives Chamber has 448 permanent seats . Unlike Senators, Representatives do not have assigned seats . The chamber is large enough to accommodate members of all three branches of the federal government and invited guests for joint sessions of Congress such as the State of the Union speech and other events . It is adorned with relief portraits of famous lawmakers and lawgivers throughout history . The United States national motto "In God We Trust" is written over the tribune below the clock and above the United States flag . Of the twenty - three relief portraits only Moses is sculpted from a full front view and is located across from the dais where the Speaker of the House ceremonially sits . </P>

What street is the capital on in washington dc