U.S. Capitol Building

If you only have time to see one thing in Washington DC, head to the U.S. Capitol, where the country's biggest decisions are made and laws are passed. There is an excellent visitors' center and regular tours are bookable online. Important stops include the Rotunda and Exhibition Hall, which depicts the construction of the building. Reach out to your Congressman or –woman or Senator for passes to the guest sections of the House of Representatives or Senate.