The White House is the U.S. president's residence and workplace, and if you put in some advance legwork, you may be able to book a free, public tour. U.S. citizens must request tours via their Member of Congress, while foreign nationals must contact their embassy. If you're unable to secure a White House tour, the White House Visitor Center at 1450 Pennsylvania Avenue NW is a perfect alternative. View over 100 historical artifacts, archival photos and videos, and interactive exhibits.