United States of America
The United States is extraordinarily diverse in its array of attractions. You will never run out of things to see; even if you think you've exhausted what one place has to offer, the next destination is only a road trip away.
The Great American Road Trip (see above) is the most traditional way to see a variety of sights; just hop in the car and cruise down the Interstates, stopping at the convenient roadside hotels and restaurants as necessary, and stopping at every interesting tourist trap along the way, until you reach your destination.
Indescribably beautiful scenery, history that reads like a screenplay, entertainment options that can last you for days, and some of the world's greatest architecture—no matter what your pleasure, you can find it almost anywhere you look in the United States.