Embassy World lists the contact information and websites for all of the embassies around the world. The site has listings of all of the embassies resources available by nation and a separate listing for all of the foreign embassies located within the United States.
It also has detailed information about UN missions and other international organizations. Some of the other features include voltage requirements by country and an international telephone directory.
Before traveling to any country, check the appropriate embassy for visa requirements, safety information, and it’s a good idea to register with your embassy when you’re travelling.