This site covers everything from how to get a passport (and how long it will take to get it) to information on travel warnings (i.e., hot spots around the world that the State Department has deemed an unsafe place to travel). Document requirements for international travel are spelled out depending on your citizenship status, and tips for safe international travel are also provided.
The site also makes available consular information sheets for countries around the world. These sheets include such information as location of the U.S. embassy or consulate in the subject country, unusual immigration practices, health conditions, minor political disturbances, unusual currency and entry regulations, crime and security information, and drug penalties. If an unstable condition exists in a country that is not severe enough to warrant a Travel Warning, a description of the condition(s) may be included under an optional section entitled "Safety/Security."
The State Department's International Travel Site also provides information for students who are studying abroad (or on spring break) in other countries.