You've decided you want a vacation, but there's a problem -- you don't have a passport. Maybe you've never had the time, money or desire to travel abroad previously, or perhaps your old passport has expired. Whatever the reason, you still have choices.
One option is to take a closed-loop cruise -- a round-trip sailing that leaves from and returns to the same U.S. port. For that, you need only a birth certificate and a driver's license (or other acceptable, government-issued photo ID).
You can't cruise just anywhere on a closed-loop sailing, but the choices are more interesting than you might expect. Below, we've compiled a list of seven places to visit without a passport, from scenic Alaska to the beachy Caribbean.