The US Capitol: Inside America's Iconic, Imperfect Monument

The gleaming white dome above Washington DC has become synonymous with American democracy. This neoclassical masterpiece — designed in part by an amateur architect — survived British arson and a century of expansion. It also reflects one of American history’s most uncomfortable truths: a significant portion of its labor force was enslaved.

A Site Chosen by Compromise

The nation’s capital location was disputed between northern and southern states. Alexander Hamilton brokered the deal: the federal government would assume Revolutionary War debts, and in exchange the capital would sit along the Potomac River. Thomas Jefferson proposed naming the building the “Capitol,” after Rome’s Temple to Jupiter on Capitoline Hill — a deliberate signal about American democratic ambitions.

Pierre L’Enfant designed the city but never produced Capitol blueprints. Jefferson organized a design competition, and in 1793 an amateur named William Thornton submitted the winning entry. His design, influenced by the Louvre’s eastern facade, featured a small central dome. George Washington approved it personally.

Construction, Fire, and Reconstruction

Ground was broken in a Masonic ceremony on September 18, 1793. The design team clashed repeatedly — with each other and with the founding fathers overseeing the project. By 1800, only the Northern Wing was complete, but Congress held its first official Washington session there on November 17.

British forces set fire to the Capitol during the War of 1812. The flames consumed most of the interior before a sudden rainstorm extinguished them. Reconstruction lasted five years. By 1827, total construction costs had reached $2.4 million — roughly $63 million in today’s currency.

The Dome That Changed Everything

The 1850s expansion was transformative. Congress had grown; the building no longer fit. Architect Thomas Walter designed new Senate and House wings that doubled the building’s length, and replaced the original modest dome with an enormous cast-iron structure that tripled the original height to approximately 88 meters.

The new dome weighed over four million kilograms. It was still under construction during the Civil War — a fact Lincoln used deliberately, keeping the project running as a symbol of Union permanence.

What’s Inside

The Capitol’s interior is a concentrated exhibition of American self-mythology. The rotunda features The Apotheosis of Washington — a 4,600-square-meter fresco painted by Constantino Brumidi — and the Frieze of American History depicting 19 scenes spanning 1878 to 1953.

National Statuary Hall contains two statues from each state, including Hawaii’s 6,800-kilogram bronze sculpture of King Kamehameha. Underground tunnels connect the building to other government offices via a small subway system. The crypt — originally designed to hold George Washington’s remains — sits empty at his request.

Violence and Ceremony

The Capitol has been the site of both national ceremony and outright violence. Andrew Jackson survived an assassination attempt on the steps in 1835. The building was bombed three times in the 20th century without casualties. Three shooting incidents have taken place inside. On January 6, 2021, a mob breached the building during certification of the presidential election.

Presidents are inaugurated on the Capitol’s steps. State funerals are held in the rotunda. The building embodies the American contradiction Jefferson built into its name: a temple to democracy, partially constructed by people who were not free.

Sources

• Architect of the Capitol official records and historical documentation.
• Library of Congress Capitol construction archives.
• U.S. Senate historical office publications.