Guides by Lonely Planet
Since 1800, this is where the legislative branch of American government – ie Congress – has met to write the country's laws. The lower House of Representatives (435 members) and upper Senate (100) meet respectively in the south and north wings of the building. Enter via the underground visitor center below the East Plaza. Guided tours of the building are free, but you need a ticket. Get one at the information desk, or reserve online in advance (there's no fee).