1793 AD: cornerstone and federal ambition
In 1793 AD, the cornerstone ceremony set the long construction process in motion on what became Capitol Hill. From the start, the building was designed as both a working legislature and a symbolic stage for a new federal state. That dual role still shapes the visitor experience today.
1814 AD: fire, rupture, and rebuilding
British troops burned the Capitol in 1814 AD, forcing Congress into temporary quarters before rebuilding restarted. The post-fire phase was not a simple repair; it reset major interior decisions and materials. You still walk through spaces shaped by that reconstruction logic.
1856-1866 AD: the cast-iron dome era
The current cast-iron dome was built from 1856 AD to 1866 AD, and the Statue of Freedom was set in place in 1863 AD. This was the architectural move that fixed the modern skyline identity of the Capitol in Washington, DC. When you approach from the Mall side, you are reading that 19th-century decision in real time.
2008 AD: the underground visitor center shift
The underground Capitol Visitor Center opened in 2008 AD and added nearly 53,884 m² (580,000 ft²) of visitor-focused space on the east side. That move changed the visit flow from surface queues to a structured below-ground entry experience. In practice, most planning decisions now start with the visitor center, not the exterior steps.