This Center for Disease Control travel site gives travel health-related information by destination on vaccines, health threats, etc. There are resources for yellow fever vaccination clinics and private travel clinics. There are links to all the state health departments and guidelines for safe food and water and mosquito and tick protection.
This State Department Site explains how to obtain, replace or change a passport. Applications and forms can be downloaded for ordering and renewing passports. There is also travel information and news on where passports are required.
This site has a world site that gives current time in cities all over the world. There are international calling codes, a sunrise and sunset calculator, a distance calculator for figuring out the distance between two cities, current and past daylight savings time around the world and a time zone converter.
This site provides tips on safe traveling and contains lists of permitted and prohibited items allowed on planes. There is information on what to expect from the screening procedure and tips for packing and traveling with children.
This site contains rules for bringing items back from your trip for U.S. citizens. There are answers to frequently asked questions posed by U.S. residents who travel outside the United States and travel advisories.